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...
By this time it was daybreak.这时天已破晓。We left before daybreak.我们是在黎明前出发的。Daybreak found us on a cold, clammy ship...天亮时我们发现自己呆在一条冰冷黏湿的船上。It was daybreak before Fitzpiers and Suke Damson re - entered Little Hintock.天大亮后,菲茨比...
His research is for the betterment of mankind.他的研究是为全人类造福。Anyway, regardless of the resolution , we are all making a commitment toward betterment.不管怎么说, 别提决心, 我们都在保证朝着更好努力.I appreciate his many contributions to the bette...
The little girl commenced to cry when she saw the snake.这小女孩一看到蛇就开始哭了起来.After the election the new government commenced developing the roads.选举后新政府开始修建道路。The hunter knelt beside the animal carcass and commenced to skin i...