Assessment of Gastric Emptying by SHR20004 in Healthy Subjects

Inclusion Criteria: 1. Voluntarily sign an informed consent form before participating in activities related to this trial and be able to understand the procedures and methods of the trial. Be willing to strictly follow the clinical trial protocol to complete the trial. 2. Healthy males or females aged 18-55 years (inclusive, as of signing the informed consent form). 3. Body mass index (BMI) between 19 and 28 kg/m2 (inclusive), with a weight ≥ 50 kg. 4. Have not used GLP-1 or its analogs, DPP Ⅳ inhibitors or its analogs, or other glucose-lowering drugs. Exclusion Criteria: \- 1\. Subjects with any of the following conditions or medical history: 1. Any clinical disease that the investigator determines may affect the safety or results of the study. 2. Diagnosed with diabetes according to the WHO guidelines for the diagnosis and management of diabetes. 3. A history of thyroid cancer or family history of thyroid cancer, a history of pancreatitis, or symptomatic gallstones. 4. History of severe systemic infection within 1 month of screening. 5. History of severe cardiovascular disease, including decompensated heart failure (NYHA class III or IV), unstable angina, stroke or transient ischemic attack, myocardial infarction, persistent and clinically significant arrhythmia, or history of coronary artery bypass surgery or percutaneous coronary intervention. 6. Subjects with clinically significant abnormal thyroid function at screening. 7. Prolonged QTcF interval on screening or baseline ECG (male \> 450 ms, female \> 470 ms), or other clinically significant abnormalities that may result in a significant safety risk for the subjects. 8. Subjects with severe mental disorders. 2\. Use of prescription drugs (topical eye/ nasal drops and ointments are allowed) and over-the-counter drugs, food supplements, vitamins, and Chinese herbs within 2 weeks before the start of treatment (routine vitamins are allowed). 3\. Any of the following: 1. A history of recurrent or severe drug-food allergies, or known or suspected allergy to any component of the investigational drug. 2. Participation in any drug clinical trial within the past 3 months (defined as receiving trial drug treatment). 3. Consumption of more than 14 standard units of alcohol per week (1 standard unit contains 14 g of alcohol, such as 360 mL of beer or 45 mL of alcohol with a 40% alcohol content or 150 mL of wine) within the past 1 year, or a positive breath alcohol test. 4. A history of smoking (≥5 cigarettes per day for the past 1 year) or a history of smoking in the past 1 year; subjects who cannot or are unwilling to abstain from smoking during the study period, or subjects who cannot use nicotine gum or transdermal nicotine patches. 5. Long-term or consumption within the past 48 hours of coffee, tea, chocolate, or soft drinks that contain methylxanthines (theophylline, caffeine, or theobromine), such as Coca-Cola. 6. Participation in intense exercise within the past 48 hours, such as weightlifting, sprinting, long-distance running, cycling, swimming, or soccer. 7. Known or suspected history of drug abuse or a positive urine drug screening test during screening. 8. Blood donation of ≥400 mL within the past 3 months or subjects with a bleeding event of ≥400 mL within the past 3 months, such as major surgery or trauma. 9. Positive serology for hepatitis B surface antigen (HBsAg), hepatitis C (HCV), syphilis, or human immunodeficiency virus (HIV) antibodies. 10. Subjects who are assessed by the investigator as having poor compliance or arm vein condition that cannot allow blood to be drawn, or subjects with a history of fainting or dizziness with needles. 11. Pregnant and lactating women, or male and female subjects who are of childbearing age and do not wish to use effective contraception for 2 weeks after the last dose of study medication. 12. Subjects who, in the opinion of the investigator, have any other condition that could interfere with the evaluation of the trial results.