Question

Then I began by saying:“..................”中by是什么意思 为什么这么用

Answer 1

y引导方式状语，可翻译为“通过...”。

Then I began by saying 接着我通过说...来开始

Tom goes to school by bus everyday. Tom每天都坐公交去上学。

You can make an emergency call by dialing 911. 你可以通过拨打911来紧急求助。