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
I'm glad I got to know you.
我很高兴能够认识你。
Do not give a dog bread every time he wags his tail.
不要有求必应。
Have you received a letter from Jim yet?
你收到了吉姆的来信没有？