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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？

4·Sound, light and color are all interconnected at source.

声音、光和颜色均在源上相互连接。

5·The drive types at source and destination arrays can be different.

源阵列和目标阵列的驱动器类型可以不同。

6·Where there is no such exemption at source they normally apply a refund procedure.

如果没有免除来源的话，他们通常也可以申请一个退还手续。

7·This portion of agricultural products consumed at source by the peasants is enormous.

这个农民自给的部分，数量极大。

8·They aim to stop an event at source, before it has a chance to become an international threat.

《条例》的目的是在有机会成为国际威胁之前，从根源制止事件的发生。

9·Unilever is entitled to withhold at source if required by any local income tax law or regulation.

联合利华有权按照任何地方性所得税法或规定的要求作为付款人进行代扣代缴。

10·The Royal Navy's ability to conduct expeditionary operations enables the UK to combat security threats at source.

皇家海军进行远征作战的能力，使英国从源头上打击安全威胁。