它控制运动以确保光合作用的最佳光线条件。
It controls locomotion, ensuring optimum light conditions for photosynthesis.
她母亲说，有一次她为了拍一朵野花，整个下午都蹲在那里，尝试不同角度，等待最佳光线，只为拍一张完美照片。
Her mother remembers one time when she was taking a photo of a wild flower. She squatted there for an entire afternoon, trying different angles and waiting for the right light to get the perfect shot.
当构图、光线及曝光都十分出色时，“最佳”实在是个人有个人的标准。
When composition, light, and exposure are all superb, "best" truly is in the eye of the beholder.
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