buck

他总是推卸责任，从来不肯自己承担。

He always tries to pass the ___buck and never takes responsibility himself.

我在口袋里找到了一美元。

I found a ___buck in my pocket.

这只小公鹿的角还没分叉，是一只典型的幼年雄鹿。

The ___buck had straight antlers, indicating it was a young male deer.