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
This is as useful as screen door on a submarine.
这毫无用处。
Justice has long arms.
天网恢恢，疏而不漏。
We'll pay up as soon as we can.
我们会尽快付清的。