When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.

当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。

youdao

They are going to check my safety rig and if they say you can go off that bridge, I'll trust them that it's okay."

VOA: standard.2010.07.26

The displaced are heading off in different directions in search of safety.

VOA: standard.2009.08.21

With three games left Hull are in the Premier League relegation zone, three points off safety.

BBC: Scan all-clear for Hull striker Vennegoor of Hesselink

Four points off safety with two games to go, Saints will lose 10 points if they stay up in the Championship.

BBC: Penalised Saints face relegation

If, as anticipated, the League enforce this rule, Pompey would have a total of seven points - a massive 17 points off safety.

BBC: Administrator vows to save debt-ridden Portsmouth