Eustele
n. [植]真中柱( 存在于大多数裸子植物和被子植物的茎内)
🗣️ 情景例句
It's nice meeting you.
很高兴认识你。
He may well be contented who need neither borrow nor flatter.
一个既不用借债又不用奉承人的人，可以称得上心满意足。
For our purposes, we are concerned only with one kind of cost----
就我们的目的而言，我们只关心一种费用-