1
the diameter of sth
Measure the diameter of the circle.
测量这个圆的直径。
直径
先理解核心含义，再看它在真实句子里的用法。
直径
the length of a straight line through the center of a circle or sphere that connects two points on its outer edge; also such a line itself
Measure the diameter of the circle.
测量这个圆的直径。
直径
Any straight line between two points on the circumference of a circle that passes through the center of the circle; a chord that passes through the center of the circle.
通过圆心并连接圆周上两点的直线长度
the length of a straight line passing through the center of a circle and connecting two points on the circumference
直径长度
The length of such a line.
连接圆心与圆周上两点(或球体表面上两点)的直线
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
The diameter of the pipe is 10 centimeters.
这根管子的直径是10厘米。
To calculate the circumference, multiply the diameter by π.
要计算周长，将直径乘以π。
The tree trunk had a diameter of over two meters.
这棵树的树干直径超过两米。
Measure the diameter of the circle.
测量这个圆的直径。
用于描述物体的直径尺寸。
The pipe is 5 cm in diameter.
这根管道直径为5厘米。
The tree has a diameter of 2 meters.
这棵树的直径为2米。
Not this
The circle diameters 10 cm.
Use this
The circle has a diameter of 10 cm.
“diameter” 是名词，不能用作动词。正确表达是 “have a diameter of” 结构。
Not this
The radius of the circle is 20 cm.
Use this
The diameter of the circle is 20 cm.
混淆了 “diameter”（直径）和 “radius”（半径）。直径是半径的两倍，此处应使用 “diameter”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
外径
The outer diameter of the pipe is 10 centimeters.
管道的外径是10厘米。
内径
The inner diameter must be large enough for the cable to pass through.
内径必须足够大以便电缆通过。
圆的直径
The diameter of a circle is twice its radius.
圆的直径是半径的两倍。
测量直径
Use a caliper to measure the diameter of the sphere.
用卡尺测量球的直径。
地球直径
The diameter of the Earth is about 12,742 kilometers.
地球直径约为12,742公里。
Use diameter naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象用尺子（meter）穿过（dia-）圆心，量出直径。
语域：formal 常见场景：mathematics、geometry、engineering 通常用于数学或科学语境。
Parameter rhymes with diameter: both stress the 'a' and end in /æmɪtə(r)/. Other -meter words like perimeter, thermometer, barometer have different stressed vowels (e.g., /ɪ/ in perimeter, /ɒ/ in thermometer/barometer) and do not rhyme. Centimeter and millimeter also have different stress patterns and do not rhyme.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.