Epitrochoid
[机] 外转轴线
🗣️ 情景例句
I woke up when I heard someone speak.
一听到有人说话我就醒了。
Where will they be going for their holiday?
他们休假时要上哪去？
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。