an optical instrument designed for simultaneous use by both eyes 同义词：binoculars, opera glasses,
例句与用法
1.
Large sunspots can comfortably be seen through field glasses . 大的太阳黑子用双筒望远镜就能看得很清楚。
2.
Even a careless momentary look through the eyepiece of field glasses or the telescope can do great harm to the eyes . 通过望远镜或双筒望远镜的目镜，即使对太阳只是漫不经心的一瞥，也会对眼睛造成严重的伤害。
3.
Waves o er the waters dull . he crossed at nassau street corner and stood before the window of yeates and son , pricing the field glasses 他在纳索街角穿过马路，站在耶茨父子公司169的橱窗前，估计着双筒望远镜的价码。
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