翻译 这些新研制的药必须在动物身上做实验以确保其安全性. (ensure , test ) 大颗

The newly - developed medicine must be tested on animals toensure they are safe.
Large drops of tears dripped down from her eyes,and she must have been extremely sad.
Young people should be encouraged to be unique and unconventionalabout their concepts .
The problem of the earthquake forecast is not unique to China,which is a global problem.
The tourists sued the tourist company/ travel agency successfullyfor the damages after the accident.