...必要性”在语意上有一 定的范围，这一范围的一端是“不可缺少”（indispensable），另一端是“有助于”（making a contribution）。而第20 条中的“所必需的”显然更偏向于“不可缺少”这一端。
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You're making a contribution. Sharing your gifts.
你的贡献在于，你分享了你的天赋。
youdao
You know you are on the right path when you are making a contribution to others.
当你正在为他人做出贡献时，你就已经找对了路。
And as long as I'm making a contribution that is valued, I'll have no reason to leave.
同时，只要我作出的贡献是有价值的，我没有理由离职。
Women are looking for career development as well as making a contribution to the nation.
NPR: Women in Combat: Rules and Reality
And what will make you satisfied and fulfilled that you are indeed making a contribution?
FORBES: What's Your Personal Brand?
The best rule of thumb is to use extreme caution if someone tries to pressure you into making a contribution.
FORBES: Cyber Crooks See Huge Opportunity In Japan's Tragedy
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