In the first study, three-year-olds watch two videos shown side by side.
在第一项研究中，三岁的孩子们观看了并排播放的两段视频。
This is the first study to link the two events.
这次发掘是首次将这两个事件联系到了一起。
This is not the first study to associate TV time with ill effects.
这并不是第一次将看电视时间与患病相联系的研究。
But this is the first study to examine honey's effect on human blood.
研究蜂蜜对人体血液的影响，这还是首次。
This is the first study to investigate the effect of exercise during treatment.
这首次探讨了运动在乳腺癌治疗过程中的作用。
This is the first study to investigate the effect of exercise during treatment.
这首次探讨了运动在乳腺癌治疗过程中的作用。
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