例句與造句

1. If the same phellogen functions from year to year , as in beech and oak , then the bark is smooth and consists only of tissue external to the phloem , mainly cork
   如在櫸木或橡木中，相同的木栓形成層年復(fù)一年的活動(dòng)，那么樹皮是光滑的，并且僅形成韌皮部的外方組織，主要是木栓（軟木） 。
2. It's difficult to find phellogen in a sentence. 用phellogen造句挺難的