He overbalanced and fell head first.
他失去了平衡，头部先着了地。
He fell head first down the stairs.
他倒栽葱摔下楼梯。
She got divorced and rushed head first into another marriage.
她离婚后又仓促再婚了。
Don't plunge head first into another person's room.
别冒冒失失地撞进别人的房间。
她头朝下跳进水里。
He plunged head first into the stream.
他头朝下跳入河中。
Retrieves, but does not remove, the head (first element) of this list.
检索，但不删除此列表的头(第一个元素)。
Retrieves and removes the head (first element) of this list.
检索并删除此列表的头(第一个元素)。
Retrieves and removes the head (first element) of this list.
检索并删除此列表的头(第一个元素)。
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