serve the purpose 有助于解决 ; 顶用 ; 符合目的 ; 管用
serve the purpose of 用作 ; 充任
to serve the purpose 符合需要
serve the desired purpose 用得着
serve (the purpose)
服务于（目的）
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
The assumption is that even if this DNA doesn't make up any of the genes, it must serve some other purpose.
这个假设是，即使这个 DNA 不构成任何基因，它一定有其他的用途。
And they weren't selected (by prosecutors) for this hearing that we've had thus far because that didn't serve the purpose of the hearing.
CNN: Defense battles social media blizzard in Ohio rape case
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