有人研究过纳米声纳没?
很少有人研究万圣节到底对孩子会产生怎样的影响。
There have been few studies to examine how the holiday affects children.
没有人研究过蓝牙耳机会不会对健康造成影响。
Nobody has conducted research looking at the health effects of Bluetooth earpieces.
And it was a practice that was not broadly used until somebody really studied systematically.
这项技术一直没有广泛应用,直到有人系统地研究它
Over the last five, ten years there's been some work done on this.
在过去五,十年里,有人做了一些有关笑的研究。
Somebody mentioned it already over there.
已经有人在研究了
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