Ideas such as drill, drill down must be focused on a point to have power.

思想如钻子，必须集中在一点钻下去才有力量。

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In this case, light rays are focused on a point behind the retina.

在这种情况下，光线集中于在视网膜之后的点。

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In this case, light rays are focused on a point behind the retina.

在这种情况下，光线集中于在视网膜之后的点。

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