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。

My income is taxed at source.

我的收入已先行扣除了所得税。

Is the water polluted at source?

河水是在源头受到污染的吗？

Sound, light and color are all interconnected at source.

声音、光和颜色均在源上相互连接。

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。