stem

‘Writ ’ is the stem of the forms ‘writes ’, ‘writing ’ and ‘written ’..writ是writes、writing和written三个词的词干。

stem cell,干细胞，骨髓干细胞

stem from,起源于

brain stem,脑干

drill stem,钻柱；钻杆；钻具

main stem,[美俚]干线；主街

valve stem,【机】阀杆

from stem to stern,完全；从头到尾

stem rust,杆锈；茎锈病

hemopoietic stem cell,造血干细胞

stem borer,蛀茎虫；天牛；蔗螟；茶天牛

rising stem,升杆

stem seal,阀杆密封；芯轴密封

真题例句...that lack of enthusiasm could stem from concerns about privacy and security...第二套CET62016.12阅读理解

真题例句...Native farmers were hostile towards the wheat program because of serious crop losses from 1939 to 1941 due to stem rust...第三套CET62013.6阅读理解

真题例句...the UK National Stem Cell Network warned the UK could lose its place among the world leaders in stem cell research unless adequate funding and legislation could be assured...CET62011.12阅读理解