封锁；隔开；掩盖

v.封锁

back off───后退；软化；减轻；卸下

blank out───作废；取消

blast off───点火起飞；发射升空（等于blast-off）

block off───阻挡；封堵

bunk off───逃学（非正式）；早退（非正式）

slack off───偷懒；懈怠

blanks out───作废；取消

blast offs───点火起飞；发射升空（等于blast-off）

blasts off───点火起飞；发射升空（等于blast-off）

He had the feeling that everything he saw was a broken-off piece of some giant blank thing he had forgotten had happened to him.───他有种感觉，觉得他看见的一切都是之前发生过的，他已经忘记的，某件大而无用的事掉落的碎片。

Article 5 no entity or individual may blank off or monopolize the market of motor vehicle maintenance.───第五条任何单位和个人不得封锁或者垄断机动车维修市场。

The system uses the simplest axial-flow sleeve as flow control valve to blank off, isolate and select reservoir. The system adopts all-hydraulic operation.───本系统使用最简单的轴流类滑套作为流量控制阀，用以封堵、隔离和选择油层，并采用全液压方式进行动作控制。

Sprinkler heads at the store , if any, shall be blank off.───如该仓库有消防花洒头, 须予以封闭.