基本解释下拉荷载同根派生 downdrag相关词英汉例句Analysis results show that location of pile neutral point is the lowest and downdrag caused by NSF is maximal if neglecting working load on pile top. 分析结果表明，不考虑桩顶荷载的中性点位置是最低的，下拽力是最大的。downdrag更多例句