While[usage-while]

While。避免不加区别地用这个词来代替and、but和although。许多作者频繁用它来替代and或but，要么只是想让连词有些变化，要么是不确定这两个连词哪个更合适。在这种用法中，最好用分号代替它。

• 误：The office and salesrooms are on the ground floor, while the rest of the building is used for manufacturing.
• 正：The office and salesrooms are on the ground floor; the rest of the building is used for manufacturing.

在不会导致歧义或荒谬的句子里，把它当作although的近乎对等的词使用是允许的。

While I admire his energy, I wish it were employed in a better cause.

这完全正确，如下面的改写所示：

I admire his energy; at the same time, I wish it were employed in a better cause.

比较：

While the temperature reaches 90 or 95 degrees in the daytime, the nights are often chilly.

下面的改写表明，为什么这里的while用得不正确：

The temperature reaches 90 or 95 degrees in the daytime; at the same time the nights are often chilly.

总的来说，作者最好只在严格的字面意义上使用while，即"during the time that"（在……这段时间里）。