Other causes are harder to pin down.

其它原因就很难下定论了。

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But it is harder to pin down more subtle health effects.

但是限制对健康的影响多一点，难度就更大一点。

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Real life skills are harder to measure, harder to pin down, but so much more beneficial.

真正的生活技能难以测量，难以确定，然而却使人受益匪浅。

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But Ames theorist Jack Lissauer says that if no transits are observable, it will be much harder to pin down the orbits and masses of these planets.

但是艾姆斯研究中心的理论家杰克·利索尔称，如果没有可以观察的凌日现象，要想确定这些行星的轨道情况和质量就会难得多。

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But Ames theorist Jack Lissauer says that if no transits are observable, it will be much harder to pin down the orbits and masses of these planets.

但是艾姆斯研究中心的理论家杰克·利索尔称，如果没有可以观察的凌日现象，要想确定这些行星的轨道情况和质量就会难得多。

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