她轻声发出“嘘嘘嘘”的声音，让孩子们保持安静。

She made ___sh-sh-sh sounds to remind the kids to stay quiet.

护士轻轻地对哭闹的孩子说“嘘嘘嘘”，让他安静下来。

The nurse gently said "___Sh-sh-sh" to calm the crying child down.