take a 与by的意思不同。

take a 翻译成坐。例句:You are probably well enough to take a little light exercise.你恢复得不错，大概可以做些轻微的运动了。by的意思是通过。例句:Most information was collected by direct observation of the animals' behaviour.大部分信息都是通过直接观察动物的行为收集到的。