Draw the floss backwards and forwards between the teeth.将牙线在齿间来回拉动。He works backwards, building a house from the top downwards.他把工序倒过来了，从上往下建房子。The third wave was so strong it knocked me backwards.第3波浪太大了，把我打了回去。...
He felt suddenly faint, and his heart began to palpitate.他突然感到眩晕，心脏开始悸动。I felt my heart palpitate.我感到心在怦怦跳.The air of the sleeping - chamber seemed to palpitate with the hopeless passion of the girls.寝室里面的空气,好象跟着那些女孩子们那种...