Knocks
n. 短促的敲打（声）( knock的名词复数 ); 爆震声; 敲击声; 敲门（或窗等）声\\nv. 敲, 击, 打( knock的第三人称单数 ); （心）怦怦跳; 把…撞击成（某种状态）; 批评
🗣️ 情景例句
For example, did you know that 1 in 4 teenagers has tried marijuana?
比如，你是否知道4个青少年中就有1位曾经吸过大麻？
Who called a while ago?
刚才谁在打电话？
There is a river in the picture.
画里面有一条河。