When it’s done in the lab, Hayes uses video microscopes to examine people’s tongues.
在实验室做这个实验时，海斯用视频显微镜来观察人们的舌头。
When it's done in the lab, Hayes USES video microscopes to examine people's tongues.
在实验室做这个实验时，海斯用视频显微镜来观察人们的舌头。
When it's done in the lab, Hayes USES video microscopes to examine people's tongues.
在实验室做这个实验时，海斯用视频显微镜来观察人们的舌头。
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