尚且的英文：
even

Even the quality of the best products is not worth much, to say nothing of those lower down.
最好的产品质量尚且如此,等而下之的就不必说了。

If you must work so hard, how much more must I?
你尚且如此刻苦，我一定要更加努力才行。

If you can't persuade him to lend us the money, how do you expect me to work the oracle?
如果你尚且不能说服他借钱给我们,又怎能指望我做得到呢?