Calculous
a. 結(jié)石的\\n[醫(yī)] 結(jié)石的
??? 情景例句
Who wants to begin?
誰先開始？
It takes a bit of nerve to cross these chain bridges.
過這種鐵鎖橋需要有點(diǎn)膽量才行。
Every year, several classes visit the factory.
每年都有好幾個班去參觀這家工廠。