Always read the instructions before you start.

使用前务请阅读操作说明。

《牛津词典》

It is important to get the coals white-hot before you start.

在开始之前把炭火烧旺很重要。

《柯林斯英汉双解大词典》

Before you start on these chapters, clear your head.

在你开始这些章之前，先理清思路。

《柯林斯英汉双解大词典》

Mike Lizotte of American Meadows, an online store, says before you start, you need know whether to plant tender bulbs or hardy bulbs.

VOA: special.2011.04.12

You've got to spend the time to make sure that everything is well defined before you start trying to work out these problem More about the path. There are a couple ways you could go through that pass If I look at this smooth path here.

你要花时间确认,在你开始尝试解题前,切已经被很好地定义,关于路径还有些问题,你可以用两种不同的方式经过这条路径,看这条平滑的路径。

麻省理工公开课 - 热力学与动力学课程节选

The water soluble vitamins tend to be used more immediately by the body not stored and excreted through the urine if consumed in excess, so the body can tolerate more variation in intake of these before you start getting toxicity than is the case with the vitamins on the right.

而水溶性维生素往往都立刻被身体所利用,不会被机体储藏,过剩部分由尿液排出,因此机体耐受过量水溶性维生素的能力,相比起右边这栏里的脂溶性维生素,可是要强得多了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Before you start, you need to be realistic about where your credit stands now.

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Typically this occurs (if at all) while writing the article not before you start.

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When you enter a new job, learn about that place before you start making changes.

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