1、It is treated with acid before being analysed.对它先用酸处理再进行分析。
2、Think what flower it is before move your mouse on.在你将滑鼠放到花朵上前，请先想一想，这是甚麽花
3、We want to learn what it is before anybody else does.我们想先于别人弄清楚。
before强调句例句
We had sailed four days and four nights before saw lands .
我们航行了四天四夜才看到陆地
