People send messages in this way.
问题描述：
People send messages in this way.
People send messages_____ _____ _____.同义句
The message is very important and needs to be dealt with immediately,so you mustn't be careless.
This is an ____ _____,so you mustn't be careless.同义句
In the past few months,we_____ (build) several buildings for the poor.正确形式
答
by this means
important message
have built