field glasses 是什么意思

an optical instrument designed for simultaneous use by both eyes
同义词：binoculars, opera glasses,

	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。

field glasses是什么意思