Pregrouting
预灌浆
🗣️ 情景例句
No. I really don't know how to go about it.
没有。我真不知道如何填。
I told him to come in for a few minutes.
我告诉他进来等几分钟。
but hauling it out of the water proved to be a serious problem.
可是把盘子捞出却是一个很大的难题。