研究人员表示，为了确保城市健康发展，种植和保护树木是必要的，但我们还需要做更多的工作来更好地了解城市树木，因为它们可能与乡村森林不同。
Researchers say planting and protecting will be needed to make sure cities can develop healthily, but more needs to be done to have a better understanding of city trees which may be different from countryside forests.
不过，在我们确切地了解雷公藤提取物有效而且安全之前，还需要进行更多的研究。
But more research needs to be done before we know for certain that TwHF extract works and is safe.
从长远来看，她表示，我们还需要更多的研究才能深入了解青少年的心里想法。
In the long term, she says, more research is needed for a deeper understanding of teens' emotional lives.
巴克博士认为，我们还需要对动物——比如医疗犬——在临床上如何能对患者产生影响进行大量的研究以了解更多信息。
Dr. Barker believes that much larger scale studies are needed to find out more about how animals – like therapy dogs2 – can make an impact in a clinical setting.
我们还需要更多的研究来了解在水中与细菌接触会对人类健康造成怎样的风险。
We still need more studies to tell what would be the risk to human health of this exposure through the water.
这种定义当然在很大程度上是正确的，但为了彻底了解在特定交易中的价格的意义，除了知道金钱的交易数量，我们还需要知道更多。
This definition is, of course, valid as far as it goes. For a complete understanding of a price in any particular transaction, much more than the amount of money involved must be known.
这种定义当然在很大程度上是正确的，但为了彻底了解在特定交易中的价格的意义，除了知道金钱的交易数量，我们还需要知道更多。
This definition is, of course, valid as far as it goes. For a complete understanding of a price in any particular transaction, much more than the amount of money involved must be known.
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