Day14.
Long before children are able to speak or understand a language, they communicate through facial expressions and by making noises.
早在小孩在能说或能听懂语言之前,他们就会通过做面部表情和发出噪声来与人交流。
By : 通过某种手段,方法 by means of …
Through: 时间或空间上的通过,经由;表示从头至尾的经过,
当by 和 through在表示手段方式时,可以互换。