Definition: a small, flat, usually round piece of metal used as money Level: B1
美元硬币在美国一直不太流行。
The dollar ___coin has never been very popular in the United States.
我祖父收藏来自世界各地的古币。
My grandfather collects old ___coins from around the world.
今天在人行道上发现了一枚闪闪发亮的硬币。
I found a shiny ___coin on the sidewalk today.
