Industry has been working at developing harmless substitutes for these gases.该行业一直在努力开发一些可以替代这些气体的无害物质。The extra players, or substitutes, wait until they are called.额外的运动员或是预备去替换的人没被召唤时在里面等着.He substitutes as our teacher...
She wore a lovely tiara but the groom, not to be outdone, had on a very smart embroidered waistcoat.她戴了一顶漂亮的冕状头饰，而新郎也毫不逊色，身着一件非常讲究的刺绣西服马甲。We need to find that tiara and get Venus out of there.我们要找到那头冠,并带维纳斯离开那里.She bore ...