Altern
a. [古]轮流的；交错的（等于alternate）
🗣️ 情景例句
There must be some way to put my mind to good use.
总会有办法让我发挥才智。
What's the fare?
车费多少？
We enjoy staring at them, entranced as they go about their business, unaware (we hope) of our presence.
我们喜欢入迷地看它们做事，它们不知道（但愿如此）我们就在它们身边。