Nowadays, only the two big houses remain roofed.现在，只有那两座大房子还有屋顶。They roofed the house with slates.他们用石板瓦做屋顶.The building is roofed entirely with translucent corrugated plastic.这座建筑完全用半透明瓦楞塑料封顶。...
他尝试着把牙齿放入牛奶 、 水和细胞培养液中.He tried putting teeth into milk, into water, and into cell - culture medium.然而, 在家里或学校里很少人手边有细胞培养液.However, few people keep cell - culture medium handy at home or in school.细胞 培养液 能够最好地在口外保持掉牙健康.T...