在疫苗进行人体试验之前，首先要在动物身上进行试验，以确保其安全性。
Before a vaccine is ever tested on humans, it's first tested on animals to make sure it seems safe.
原生应用程序从唯一来源获得，从而使购买简单化、更新系统化并确保其安全。
Native applications downloaded from a single source that simplifies purchases, organizes updates, and ensures security.
它是一种廉价的控制装置，帮助您计算油、传输液等的使用并确保其安全。
The Quart Oil Dispenser is an inexpensive control device, helping you account for and secure the use of oil, transmission fluid, etc.
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