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a/the sunglass + verb
此处 sunglass 指取火用的凸透镜，不是太阳镜。
A sunglass focuses the sun's rays into a small bright spot.
凸透镜把阳光聚焦成一个小亮斑。
凸透镜；取火镜
先理解核心含义，再看它在真实句子里的用法。
凸透镜；取火镜
a convex lens that focuses the sun's rays to start a fire
A sunglass focuses the sun's rays into a small bright spot.
凸透镜把阳光聚焦成一个小亮斑。
sunglasses（复数）指太阳镜；sunglass单数指取火凸透镜。
凸透镜,聚焦阳光以生火
a convex lens that focuses the rays of the sun; used to start a fire
He used a sunglass to focus sunlight onto the dry leaves.
他用一片凸透镜把阳光聚焦到干树叶上。
With a sunglass, the campers could start a fire even without matches.
有了凸透镜，露营者即使没有火柴也能生火。
The antique sunglass had a wooden handle and a thick glass center.
这片古老的凸透镜有一个木柄和厚厚的玻璃中心。
此处 sunglass 指取火用的凸透镜，不是太阳镜。
A sunglass focuses the sun's rays into a small bright spot.
凸透镜把阳光聚焦成一个小亮斑。
这个结构表示“用……来做……”。注意“太阳镜”的英文是 sunglasses（总是用复数）。
He used a sunglass to ignite the dry leaves.
他用凸透镜点燃了干树叶。
也可写作 through a sunglass，意思相同。
The sunlight can be concentrated with a sunglass.
阳光可以用凸透镜会聚。
Not this
I bought a sunglass yesterday.
Use this
I bought a pair of sunglasses yesterday.
太阳镜一般用复数形式 sunglasses，表达“一副”要说 a pair of sunglasses，而不是用单数 a sunglass。
Not this
The sunglasses is on the table.
Use this
The sunglasses are on the table.
sunglasses 是复数名词，谓语动词也要用复数 are，不能用 is；这是汉语没有名词复数变化而容易犯的错误。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
戴太阳眼镜
Always wear sunglasses when you go skiing.
滑雪时一定要戴太阳眼镜。
一副太阳眼镜
I need a new pair of sunglasses for the trip.
我需要一副新的太阳眼镜去旅行。
戴上太阳眼镜
She put on her sunglasses after stepping outside.
她一走出去就戴上了太阳眼镜。
摘下太阳眼镜
He took off his sunglasses as he entered the dark room.
他走进黑暗的房间时摘下了太阳眼镜。
偏光太阳眼镜
Polarized sunglasses are great for driving on sunny days.
偏光太阳眼镜非常适合在晴天开车时佩戴。
太阳眼镜盒
This leather sunglass case protects my glasses from scratches.
这个皮革太阳眼镜盒保护我的眼镜不被刮花。
到芝加哥还有106英里，我们有一满箱油、半包烟，天黑了，还戴着墨镜。出发吧。
The Blues Brothers are known for their black suits and sunglasses.
《蓝调兄弟》以黑色西装和墨镜的形象闻名。
我在夜晚戴着墨镜。
He put on his sunglasses and stepped into the blazing sun.
他戴上太阳镜，走进烈日下。
Use sunglass naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：sun（太阳）+ glass（玻璃）＝把阳光聚成焦点的凸透镜/取火镜；复数 sunglasses 才是日常说的『太阳镜』。
语域：formal 常见场景：historical texts、optical textbooks 这个义项指用于聚焦阳光取火的凸透镜，比较正式且偏技术/历史用语，通常出现在历史叙述或光学类读物中；日常口语很少用。
表示‘太阳镜’时通常用复数 sunglasses；单数 sunglass 多指聚光取火的凸透镜。
Dictionary facts from ECDICT, WIKTIONARY.