He was trying to keep out of the bird's line of sight.他试图躲到那只鸟看不到的地方。Peg down netting over the top to keep out leaves.用销钉在顶上加固防护网，防止叶子落入。She stamped her feet on the pavement to keep out the cold.她在人行道上跺着双脚取暖。...
针对他们各人不同的需要挑选柔软、软硬适中或者坚硬的床垫。Choose a soft, medium or firm mattress to suit their individual needs.他一头柔软卷曲的黑发，眼睛又黑又亮。He had fuzzy black hair and bright black eyes.他舒舒服服地坐在柔软的躺椅上。He was comfortably seated in a soft reclini...
这种蜡质属于乙醇有机溶剂的萃取物.The waxes are classed as alcohol or organic solvent extracted materials.这种萃取改变了整个毛纤维中所有细胞膜的网状结构.Such extraction modifies the whole cell - membrance network throughout the wool fiber.用各种稀的无机酸来萃取阴离子.A vari...