只有少数几个这样的梯田已在光达的调查之前被揭示，所以科学家们还不知道这样的农模式对于玛雅大都市的生活有多重要。
Only a few such terraces had been mapped before the recent LiDAR survey, so scientists hadn't yet known just how crucial this form of agriculture was to life in the Maya metropolis.
科学家们想知道火卫一是被火星捕获的小行星还是在轨道上形成的星体，还想了解火卫一上是否有水或曾经有过水。
Scientists would like to know if Phobos is a captured asteroid or formed in orbit, and whether it had, or has, water.
科学家们不知道那种自然过程需要多长时间，不过，据麦克林博士说，这被视为限制因素，而且在那段时间内，二氧化碳有可能泄漏。
Scientists don’t know how long that natural process will take, but it is considered the limiting factor, according to Dr. McLing, and the CO2 could leak out during that time.
它已经被研究了很多年，但是科学家们之前不知道它与瘙痒有关。
This gene has been studied for years, but scientists didn't know it was linked to itching .
它已经被研究了很多年，但是科学家们之前不知道它与瘙痒有关。
This gene has been studied for years, but scientists didn't know it was linked to itching .
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