Procambium
n. 原形成层\\n[医] 前形成层, 前新生层
🗣️ 情景例句
We had a cat when I was eight years old.
我八岁时养过一只猫。
One woe doth tread upon another's heels.
祸不单行。
We can offer you this in different levels of quality.
这产品我们有三种不同等级的品质。