n.茎;高脚杯的脚;烟斗柄;词干;
v.阻止;
例句:
The plant's stem is marked with thin green longitudinal stripes.
这种植物的茎上长有绿色细长条纹。
He pointed at me with the stem of his pipe.
他用烟斗柄指着我。
The administration is trying to stem the flood of refugees out of Haiti and into Florida.
政府当局正试图阻止大批难民逃离海地,进入佛罗里达。