excavation是指开挖吗? Excavation that do not require welding shall have side walls smoothly blended into the surrounding metal such that a slope of 10 degrees from the horizontal axis (pipe or plate) is not exceeded. The bottom of the excavation shall be prepared to a smooth basis. 帮忙讨论一下这个句子,给出精准的译文。查看更多13个回答 . 3人已关注