at source
释义
从根源处：指某事物的起源或原因。
例句
1·During tests over several days, the pointer or tracker tracked an IR source and directed a laser beam at that source .
在几天的测试中，指示器或跟踪器跟踪一个红外光源，并引导激光束击中目标。
2·My income is taxed at source .
我的收入已先行扣除了所得税。
3·Is the water polluted at source ?
河水是在源头受到污染的吗？
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