to produce something in a way that causes it to spread out from a central point

The equipment sent out a regular high-pitched signal. 这个设备发出有规律的高音信号。

The torch sends out a powerful beam of light. 手电筒发出一束强光。

The bushes were sending out new shoots. 灌木在长新芽。

to send something to a lot of different people, usually by post or email

We sent out the wedding invitations about three weeks ago. 大约3个星期以前我们就寄出了婚礼请帖。