They injected a mixture of chemicals into a part of the mice's brains involved in memory formation called the dentate gyrus.

他们将一种化学物质的混合物注入小与记忆形有关的部分，称为齿状回。

After being injected, the cells in the dentate gyrus would begin to produce channelrhodopsin-2, making the cells themselves sensitive to light as well.

注射后， 齿状回的细胞会开始产生 channelrhodopsin-2，使细胞本身也对光敏感。

Radial gates control how much water is released and massive  concrete blocks at the bottom of the chute, called dentates, disperse the flow to reduce erosion as  it crashes into the Feather River.

向闸门控制释放的水量，滑槽底部的巨混凝土块（称为齿状）可以分散水流，以减少水流流入羽毛河时的侵蚀。