... And Change When Necessary 以及更换 When supplements are necessary 当补充是必要的 Maintain documentation when necessary 维护所需的文件 ...
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when supplements are necessary
什么时候需要补充
以上为机器翻译结果，长、整句建议使用 人工翻译 。
You'll notice a big improvement when you both eat red meat and take iron pills (supplements are usually necessary to get out of the iron-deficient status but usually do not need to be consumed long term).
CNN: Will eating meat help recovery after long runs?
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