buzz/ b^z /

1.noun [c] 
(noise) 嗡嗡声

2.noun [inf] 
to give sb a buzz (phone call) 给某人打电话

3.vi.[insect] [ machine+] 
发出嗡嗡声

4.vt.[inf] 
(call on intercom etc) 用蜂音器传呼

to be buzzing with activity/conversation
充斥着活动/谈论