In one type of squirrel monkey, the males lack a visual pigment called L-opsin.
在一种松鼠猴中，雄松鼠猴缺少一种叫做L视蛋白视觉色素。
The L Gauge is a reliable swing arm level monitor designed for smaller diameter tanks. It provides a visual indication of the liquid level in your tank.
稳定的摇臂式液位检测器，用于直径较小的水箱。水箱有可见的液位指示。
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