as safe as houses

見house

in safe hands

safe in the knowledge that

used to indicate that one can do something without risk or worry on account of a specified fact

（用于表示因掌握了某種所說明的情況，做某事無風險或無需擔憂）因了解…情況而做某事有把握

they used to recruit hundreds a year, safe in the knowledge that many would leave.

他們過去一年招收數百人，因為他們知道很多人會離去。

to be on the safe side

in order to have a margin of security against risks

為穩妥起見；以防萬一

to be on the safe side, she had recorded everything.

為穩妥起見，她把一切都記錄下來。