Contrapropeller
整流（螺旋）推进器, 整流螺旋桨, 同轴反转式螺旋桨
🗣️ 情景例句
Mr. Nelson.
Nelson先生。
Turn up your radio please.
请你把收音机开响一点儿。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。