这些类需要在它们的使用期间存储在内存中。

These classes need to be stored in memory for as long as they are being used.

youdao

在安装或正常使用期间，打算调节的控制器应有调节方向的标示。

Controls intended to be adjusted during installation or in normal use shall be provided with an indication for the direction of adjustment.

youdao

这通过降低在文件系统处于繁忙使用期间元数据日志将“填满”的可能性而改善了性能。

This improves performance by making it less likely that your metadata journal will "fill up" during heavy filesystem usage.

youdao