allay-abate-alleviate

allay
He did what he could to allay his wife's fears.
他竭尽所能来消除妻子的各种恐惧。
We hope this statement will allay the public's concern.
我们希望这一声明会减轻公众的担忧。
alleviate http://www.etthink.com/thread-284265-1-1.html
Nowadays, a great deal can be done to alleviate back pain.
如今，减轻背部疼痛可以有许多方法。

abate
The doctor gave him some medicine to abate the powerful pain.
医生给了他一些药，以减弱那剧烈的疼痛。
alleviate:http://www.etthink.com/thread-284265-1-1.html