Using every declaration just once means making strict use of selector grouping.

每种声明只使用一次意味着对选择器进行更加严格的分组。

youdao

ODBC applications do not require the explicit declaration and use of host variables.

ODBC应用程序不需要显式声明，也不需要使用宿主变量。

youdao

It separates the declaration of the variable from its use, making the code a little harder to follow.

它将变量的声明与其使用分离开来，使代码的易读性降低。

youdao

The declaration allows for the use of state resources and assets to support local response efforts, MEMA said.

CNN: Tornado tears through southern Mississippi

Russia is one of many countries that call Kosovo's declaration of independence illegal, and will use its veto in the Security Council to prevent it from joining the United Nations.

ECONOMIST: The Balkans

The Declaration calls on governments to support the sustainable development and dynamic use of OERs to achieve educational goals.

UNESCO: Communication and Information