100句话7000单词-Day42

Day42. The wallflower is so called because its weak stems often grow on walls and along stony cliffs for support. 
墙花之所以叫墙花，是因为其脆弱的枝干经常要靠墙壁或顺石崖生长，以便有所依附。 stem 美 [stɛm] n.（花草的）茎;词干;（高脚酒杯的）脚;烟斗柄 He cut the stem for her with his knife and handed her the flower. 他用刀替她将花茎割断，然后将花递给她。 The stem of the bird feather is usually hollow. 鸟羽毛的羽轴一般是中空的。 Stem cell 干细胞 stem from 源于 All my problems stem from drinking 我所有的问题都源于酗酒。 vt.阻止;遏制[阻止] The doctors worked all round the clock to stem the epidemic. 为遏制传染病，医生们昼夜工作。 It has historically taken OPEC many attempts to stem price declines. 历史上，欧佩克进行了很多次的尝试才遏制住了价格的下滑。