A dark red stain was spreading across his shirt.一块深红色的污渍正在他的衬衫上渗开。She couldn't rub off the blood stain on her blouse.她没法将上衣的血渍擦掉.The damp rising from the ground caused the walls to stain badly.地面上升起的湿气使墙壁的颜色变得很难看....
通常床垫和床架是成套购买的。The mattress and base are normally bought as a set.这张旧床的床架是铜的.This old bed has a copper frame.这张旧床的床架是铁的.This old bed has an iron frame....
再折一下，把末端对齐。Make another fold and turn the ends together.电线末端意外地与开关接合在一起.The end of the wire had become accidentally fused with the switch.在需氧体系中, 氧是末端电子接受体并且被还原.In aerobic systems, oxygen is the terminal electron accepto...