It is a letter rejecting the buyer's request for a 10% commission instead of 5% and payment by D/P instead of L/C.

信中卖方拒绝接受买方的还盘：由5%的佣金增到10%； 凭信用证支付改为凭付款交单的支付方式。

youdao

So if we compare l increasing here, so a 3 s to a 3 p to a 3 d, what we find is that it's only in the s orbital that we have a significant probability of actually getting very close to the nucleus.

我们比较当ｌ变大的时候，从３ｓ到３ｐ到３ｄ,我们可以发现只有ｓ轨道,有很大的概率,非常接近原子核。

麻省理工公开课 - 化学原理课程节选