I need to save every buck I earn.

我需要存下我赚的每一美元。

He made a quick buck by selling his old bike.

他通过卖掉旧自行车迅速赚了一美元。

Can you lend me a buck for the vending machine?

你能借我一美元买自动售货机的东西吗？

She doesn't have a single buck left in her wallet.

她的钱包里一美元都没剩下。

So someone steals Buck and sells him as as a sled dog.

所以有人偷走了巴克，把他当作雪橇狗卖了。