凝乳酵素是粗品，含有干燥表面的小牛胃壁。
Rennet is a crude preparation containing dried, ground linigs of the calf stomach.
在概略，光滑，湿，油腻或者干燥表面的标记。
科学家也正在研究病毒在干燥表面或悬服液中可以生存多久，包括在粪便中的存活时间。
Scientists are also working to determine the amount of time the virus can survive in the environment on both dry surfaces and in suspension, including in faecal matter.
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