,是 连住两夜的意思 .但是 信 的意思 宿 的意思 {本词中} 为什么会表示连住两夜呢?

Since we have stayed in the tent for two nights,we have got used to it,and nobody mentioned coldness.However,body movements conveyed our feelings at all,for we turned on the stove as soon as we got out of the tent..Nearly the same as yesterday,Isabella went to help another team to cook happily.I had breakfast with Christina together.Ham and honey,which were good enough.
Our fieldwork has already finished nearly a half.Tomorrow we will do the filling,so we have to finish it today.The whole team are pressed a lot.Artifacts are digged out from the earth bit by bit by us.The sun goes out of the clouds sometimes,and goes back sometimes.

为了减小测量误差,
如果液面不相平,测量的体积会偏大或偏小.