1·The axis of a circle is its diameter.
圆的对称中心线就是直径。
—— 《牛津词典》
2·It turns out that the diameter is actually 2.5 centimeters.
它的直径实际上是 2.5 厘米。
3·The microscope can magnify the object 100 times in diameter.
这架显微镜能把物体的直径放大100倍。
4·Nanocrystals, also known as quantum dots, are semiconducting particles with a diameter of a few millionths of a millimeter.
纳米晶体，也被称为量子点，是一种直径只有百万分之一毫米的半导体粒子。
5·It is mainly composed of a steel rectangular parallelepiped and two steel cylinders of the same diameter fixed at its two ends.
它主要由一钢制长方体和固定在其两端的两个相同直径的钢制圆柱体组成。
1·The pebble has about a one millimetre microsphere diameter. The coolant is in fact helium.
卵石大约有1毫米的球径，冷却剂就是氦气。
2·Business by inquiring for the diameter, work with security.
业务由勤学为径，工作有安全做舟。
3·Businesss by inquiring for the diameter, work with security.
业务由勤学为径，工作有安全做舟。
4·Take the pipe made of stainless steel, including stainless steel elbow, stainless steel three, stainless steel four, stainless steel different diameter pipe, stainless steel pipe cap.
采取不锈钢材质制成的管件，包括不锈钢弯头，不锈钢三通，不锈钢四通，不锈钢异径管，不锈钢管帽等。
5·The structure and measuring principle of gradient furnace were introduced, and the curve of the foam temperature and bubble diameter was drawn.
介绍了梯温炉的结构及原理，根据测量结果绘制了发泡温度与泡径的关系曲线。
1·The diameter (opening position , outer painting) of this branch pipe is not correct. It must be fabricated in accordance with the drawing.
这一支管通径（开的位置，外部涂装）不对，一定要按照图纸施工。
2·The original design of valve plate to open the gas valve is hanging in the channel, the possession of an effective diameter about 20%.
而原设计阀板打开是悬于阀体的气体通道内，占有有效通径20%左右。
3·The diameter of this pipe is 1500mm.
这根管子的通径是1500mm。