先合同义务是指合同成立前及合同无效时缔约双方当事人所负的附随义务。

Precontractual liability is a kind of collateral liability imposed on the both parties before the contract is concluded or when the contract is void.

youdao

由于负摩阻力的作用，桩身轴力随着深度的增加先增大后减小，桩侧摩阻力沿深度呈非线性变化。

The axial force of piles first increases with the depth and then decreases. The variation of negative skin friction with the depth of piles is nonlinear.

youdao

回合结束才能弃牌，但是回合结束先检查有记分牌，直接判负。没有记分牌才轮到弃牌。

The Soviets may now discard one held card at the end of the turn.

youdao

So, if you can flip your lecture notes over and just write on the blank space, we're going to cover electronegativity first here, and specifically, you can go back and fill this in to your lecture 9 notes, if you want to stay organized, but I just suggest just writing it on lecture 10 notes now and going back.

因此，请大家把讲义翻到背面,就在空白处做一下笔记，我们要先讲一讲电负性，特别提醒一下，大家可以,回到第九课的讲义并把这些记在那里，如果你想保持条理性的话,但是我建议大家先写在第十课的讲义上,回去再记到第九课的讲义上。

麻省理工公开课 - 化学原理课程节选