Before calling the server, check if the needed data is already loaded and if so, skip the call.

在调用服务器之前，检查所需的数据是否已经装载了；如果是这样，就跳过调用。

youdao

Before calling the method, you first check that there is at least one SQL warning; if so, you pass the first SQLWarning object to the appropriate method.

在调用这个方法之前，首先要检查是否至少有一个SQL警告；如果有，就将第一个SQLWarning对象传递给适当的方法。

youdao

The first time you encounter a Dictionary object in a calling method, you can check its type before working with it.

在调用方法中第一次遇到 Dictionary 对象时，可以在使用它之前检查它的类型。

youdao

My brother and I have been calling every day to check in and to take turns scolding her for riding her horse before she's well enough.

NPR: Being the Mother to a Family of Soldiers