If you want to do research in this domain, you are best off with extending the existing tools.

如果你想做研究在这个领域，你最好有扩展现有的工具。

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In fact, most nutritionists are adamant that babies are best off with nothing but breast milk for the first six months of life (they used to recommend four months, but now say six months).

实际上，大多数营养学家坚持认为，婴儿出生后的前六个月里，没有什么比纯母乳喂养更加合适(他们一开始推荐四个月)。

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Getting back into exercise can be a challenge in the best of times, but with gyms and in-person exercise classes off-limits to many people these days, it can be tricky to know where to start.

在境况最好的时候，重新开始锻炼身体也可能是一项挑战，但如今许多人都无法去健身房或参加面授的健身课程，就更是连从何处入手都很难知道。

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As a result, almost all of us are best off with a group of diversified indexed mutual or exchange traded funds and ones that come with low expense ratios.

FORBES: Too Big To Fail Banks Turn To Ma And Pa Investor To Make A Buck

As studies have long shown, most mutual-fund investors are best off sticking with cheaper passive index funds or exchange-traded funds.

WSJ: Upside: Building a Dirt-Cheap Portfolio Is Getting Even Easier

And we want you to start off with the best possible opportunities possible.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event