Emissions
n. 排放物( emission的复数形式 ); 散发物（尤指气体）
🗣️ 情景例句
but I really enjoy it.
但我确实乐在工作。
Generally speaking, it's cheaper but slower to ship goods by sea than by rail.
总的来说，海运比铁路运输更便宜，但速度慢一些。
it is quite reasonable to regard the sea floor as the basic form of the crust of the earth,
因此完全有理由把海床看作地壳的基本模壳，