bleed off pipe 溢流管
bleed off 放掉
bleed-off circuit 泄放电路
bleed-off valve 放压阀
bleed-off passage 抽气通道 ; 抽气道
Bleed off surface accumulators 地面管线排空气
bleed-off water 排出水
When advancing and uncovering coal in roadway, better construction method is vibration shot, metal framework, borehole bleed-off and hydraulic hole, of which vibration shot is principal.
井巷掘进揭煤时，较好的施工方法是震动放炮，金属骨架，钻孔排放和水力冲孔，尤以震动放炮为主。
Up to 20 percent of the top airflow should bleed off down the sidewalls.
高达20%的顶部气流应由侧壁向下流动。
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