(archaic)(of an action) be of no help at all to someone
(古)（行动）无助于
not very (or not at all) effective or successful
几乎（或根本）无效的
with little (or no) success or benefit
几乎（或根本）毫无作用；无助
he tried to get his work recognized, but to little avail.
他试图使自己的工作得到认可，但却几乎毫无作用。
To make use of.
利用