在就任何健康问题采取行动之前，我们必须首先进行评估。
Before taking action on any health problem, we must first take stock.
在我们开始之前，还有很重要的一点需要说明，对于将要进行的工作，您必须有一个整体的方法。
Before we get started, it is important to note that you must have an overall approach to what you are doing.
肥料必须在四月之前运到，否则我们不能及时地进行春播了。
The fertilizers must be delivered before April, or else we can't be in time for the spring sowing.
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