In land animals, saliva contains mucus, and provides lubrication for food in the alimentary canal.陆上动物的唾液内有粘液, 并对消化道内的食物起着润滑作用.In metal lubrication two distinct regions are recognized: boundary and hydrodynamic.在金属的润滑作用中...
The mountains resemble anthills then, with crowds streaming up their steep trails.人潮源源不绝地爬上陡峭的小径,山脉在这时就像蚁丘.The flag was streaming in the wind.旗帜在风中飘动。Refugees have been streaming into Travnik for months.几个月来不断有难民涌入特拉夫尼克。...
Red tide creatures are mainly planktonic algae, such as pyrrhophyta, bacillariophyta, flagellates and noctiluca scintillans, etc.赤潮生物主要是浮游的藻类, 如甲藻类 、 硅藻类 、 鞭毛藻类、夜光藻等....