gases是什么意思，我的回答：气体。
双语例句：
1.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。
2.There is sound scientific evidence of what certain gases do to the atmosphere. 有可靠的科学依据可以证明某些气体对大气的影响。
3.The gases that may be warming the planet will have their main effect many years hence.可能正导致地球变暖的那些气体，其主要影响将在多年后显现。
4.The volcano spewed out more scorching volcanic ashes, gases and rocks 火山喷出更多灼热的火山灰、气体和岩块。
