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Navigation is difficult on this river because of the hidden rocks. 因为河上有暗礁，所以在这条河上航行很困难。
His eyesight is becoming progressively worse. 他的视力越来越差。
The mother always kept her baby within eyesight. 这位母亲总是将孩子放在能看得到的地方。
Poor eyesight will exempt you from military service. 视力不佳将使你免服兵役。
The compass is an instrument of navigation. 罗盘是航行仪器。
The theory and practice of aircraft navigation. 航空学飞机航行的理论与实践
His bad eyesight exempted him from military service. 他因视力不好而免服兵役。
The animal's good sense of smell compensates for its poor eyesight. 这动物嗅觉灵敏弥补了视力之不足。
Navigation is difficult on this river because of the hide rock. 因为有暗礁，在这条河上航行很困难。
Is your eyesight failing recently? 你近来视力有所变差吗？
Aerial navigation by visual identification of landmarks. 地标领航用可视地标来进行飞机航行
He regained his eyesight after several operations. 他通过几次手术后恢复了视力。
The eye drops will help to improve your eyesight. 这种眼药水能改善你的视力。
The myth that eating carrot improved your eyesight was exploded years ago. 认为吃胡萝卜可以改善视力的海外奇谈，多年前已祛除殆尽。
My grandfather's eyesight is going. 我祖父的视力在减退。
She lost her eyesight at 19 months. 她19个月的时候就失明了。
You'd better wear glasses to remedy bad eyesight. 你最好戴眼镜来弥补视力不佳。
Bad eyesight is less common in this part. 这地区很少有视力差的人。
Inflect the interface for typical navigation. 为常见的导航调整界面。
The doctor corrected my poor eyesight with glasses. 医生用眼镜来矫正我的视力。