78.by birth在出生上,论出身,按血统
at birth 在出生时;
give birth to 出生
79.blame sb. for sth. 因…责备某人 .
blame sth. on sb. 把…推在某人身上
80.in blossom开花(指树木)
be in blossom开花(强调状态)
come into blossom开花(强调动作)
81.on board
到船上, 在船上, 上火车或飞机
82.boast of (or about)
吹嘘
83.out of breath
喘不过气来
84.in brief(=in as few words as possible)
简言之
85.in bulk
成批地,不散装的
86.take the floor
起立发言
87.on business
出差办事.
88.be busy with sth.于某事 。
be busy doing sth. 忙于做某事