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.

youdao

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.

youdao

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.

youdao