牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。When not removed, plaque causes tooth decay and gum disease.牙齿和牙龈之间会滋生牙斑。Deposits of plaque build up between the tooth and the gum.需刷牙以去除牙斑.It is necessary to remove plaque by brushing one's tee...
人们担心的是科学会成为工业的仆人。The fear is that science could become the handmaiden of industry.她所担心的只是他是否安然无恙。All she's worried about is whether he is all right.我最担心的是马德琳·约翰逊仍会在那儿。My main worry was that Madeleine Johnson would s...
Others are associated with the protoplasm of the cell.其它一些与细胞的细胞质有关.Each cell possesses a nucleus imbedded in protoplasm.每个细胞都具有核,细胞核位于原生质中.This release of the products of cellular protoplasm to the extracellular fluid a...
Pigeons fluttered in and out, cooing gently.鸽子们低声咕咕地叫着，扑扇着翅膀飞进飞出。Flags fluttered in the breeze.旗帜在微风中飘扬。Imes concluded from her fluttered look that she had spent the money.艾姆斯从她慌张的眼神推断出她花光了钱....