the Tropic of Cancer / the Tropic of Capricorn
两条回归线各有专名：北回归线是 the Tropic of Cancer，南回归线是 the Tropic of Capricorn，专名首字母通常大写。
The Tropic of Cancer passes through Mexico.
北回归线穿过墨西哥。
回归线；热带地区
tropics — plural of tropic
语气或修辞成分；赤道以北和以南23°26′的两条纬线；太阳可直射的最远点；热带地区的边界。；赤道以北和以南约23.5度的两条纬线,是太阳直射的最北和最南点,构成热带地区的边界。；句子中语气或修辞的成分。
either of the two parallels of latitude about 23.5° north and south of the equator, marking the boundaries of the tropics
Tropic of Cancer 指北回归线，Tropic of Capricorn 指南回归线；the tropics 指热带地区。
赤道以北和以南23°26′的两条纬线；太阳可直射的最远点；热带地区的边界。
Either of the two parallels of latitude 23°26′ north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics.
赤道以北和以南约23.5度的两条纬线,是太阳直射的最北和最南点,构成热带地区的边界。
either of two parallels of latitude about 23.5 degrees to the north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics
句子中语气或修辞的成分。
The component of tone or rhetoric in a sentence.
Each tropic marks the farthest point from the equator where the sun can be directly overhead.
每条回归线都标出了太阳能够直射的离赤道最远的位置。
用法提示：此处 tropic 为名词，指回归线（地球上两条纬线之一）。
The two tropics are drawn as dashed lines on this climate map.
这张气候地图上用虚线画出了两条回归线。
用法提示：此处 tropic 为名词，用复数形式指两条回归线。
Many birds spend the winter in the tropics, where food is easy to find.
许多鸟类在热带地区过冬，那里容易找到食物。
用法提示：此处 tropic 用作复数名词 the tropics，指热带地区（两条回归线之间的区域）。
两条回归线各有专名：北回归线是 the Tropic of Cancer，南回归线是 the Tropic of Capricorn，专名首字母通常大写。
The Tropic of Cancer passes through Mexico.
北回归线穿过墨西哥。
复数形式 the tropics 指赤道附近的热带地区，不指某一条纬线。
Many tropical fruits grow in the tropics.
许多热带水果生长在热带地区。
用 north/south of 表示位于某条回归线的北侧或南侧。
The town lies just north of the Tropic of Cancer.
这座小镇就位于北回归线以北。
grammar · medium
易错句子The weather in Hainan is very tropic.
正确表达The weather in Hainan is very tropical.
tropic 是名词，指回归线或（复数 tropics）热带地区，不能作形容词；表示“热带的”要用形容词 tropical。汉语里“热带”可以直接放在名词前作定语，所以学习者容易把 tropic 当成形容词来修饰或作表语。
grammar · medium
易错句子She spent her childhood in the tropic.
正确表达She spent her childhood in the tropics.
表示“热带地区”这一区域时，英语固定用复数 the tropics；单数 tropic 指的是回归线本身（如 the Tropic of Cancer）。汉语“热带”不分单复数，学习者容易漏掉 -s。
grammar · medium
易错句子Bananas grow at the tropics.
正确表达Bananas grow in the tropics.
表示“在热带地区”要用介词 in，因为这里是把整个区域看作一个范围；at 是把地点当成一个点，与 the tropics 不搭配。汉语的“在”不区分这两种关系，学习者容易误用 at。
北回归线
The Tropic of Cancer runs through Mexico.
北回归线穿过墨西哥。
南回归线
The Tropic of Capricorn lies south of the equator.
南回归线位于赤道以南。
热带地区
Many fruits grow in the tropics.
许多水果生长在热带地区。
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