be aware of

知道国产jiizz，意識到美女让我捅，認識到

right away

立即人人操天天射人人人玩，馬上，立刻

be at the back of sb.

支持某人

behind sb's back

暗中

put one's back into sth.

專心致志于某事

be back

回來

back and forth

來回国产一级毛片无码aaaaaa，往返在线免费观看黄色一级视频，來來往往地

back up

support, esp. in an argument

keep one's balance

保持平衡，保持冷靜

lose one's balance

失去平衡人人操操操干干，跌倒