不规则动词
中文翻译：当
同义词：
['when', 'when ever例句：1. When I was a child', 'I used to play with my friends in the park.（当我还是孩子的时候，我常常在公园和朋友们玩耍。）2. When you see me', 'please call me at once.（当你看到我的时候，请立即给我打电话。）']
例句：
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1. When I was a child, I used to play with my friends in the park.
当我还是孩子的时候，我常常在公园和朋友们玩耍。
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2. When you see me, please call me at once.
当你看到我的时候，请立即给我打电话。
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3.When we arrived at the airport, there were already many people waiting for us.
当我们到达机场时，已经有许多人在等着我们了。