And it's like if the police wanna know who placed a call, they could trace it.

再说如果警方要知道是谁打的电话，他们可以跟踪电话。

youdao

Or, they added, it could be that the populations they have been tested in already get their full daily requirement of vitamins and trace elements from diet.

或者，他们补充道，受试者已经从饮食中获得了每日必需的维生素和微量元素。

youdao