Selfpropelled
自行的
🗣️ 情景例句
A good marriage takes work and shouldn't be based on feelings alone.
一段好的婚姻要用心去经营，而不是仅仅建立在感情的基础上。
I'm sure I'll be President.
我必定会当选总统。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。