Classman
n. …年级学生（用于复合词）
🗣️ 情景例句
Oh, the usual problems.
还不是那些老问题。
When the owl sings,the nightingale will hold her peace.
枭鸟唱歌，夜莺屏息。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。