sub·serve /(ˌ)səbˈsɚ/
(vt.)對…有用,對…有幫助,對…有益,促進
Sub·serve v. t. [imp. & p. p. Subserved p. pr. & vb. n. Subserving.] To serve in subordination or instrumentally; to be subservient to; to help forward; to promote.
It is a great credit to know the ways of captivating Nature, and making her subserve our purposes, than to have learned all the intrigues of policy. --Glanvill.
Sub·serve, v. i. To be subservient or subordinate; to serve in an inferior capacity.
Not made to rule,
But to subserve where wisdom bears command. --Milton.
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subserve
v : be helpful or useful