round tube

基本解释

The effect of rolling on flow pattern in narrow rectangular channel is similar to that in the large diameter round tube, but due to the small room and surface tension effect.
摇摆对窄矩形通道内流型的影响与常规尺寸圆管相似，但由于狭小空间的限制及表面张力的作用，摇摆对两相流动并无明显影响。
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Under the body-fitted coordinates, a study of three-dimensional laminar flow and heat exchange characteristics of staggered round tube bank fin is carried out through finite difference method.
在适体坐标系中采用有限差分法对错排圆管管片式换热芯子的三维层流流动及其换热特性进行了研究。
The state-of the Art of the high-efficient continuous casting technology for slab, billet, round tube stock caster developed by the developed countries in the world iron-steel industry are discussed.
论述了世界钢铁工业发达国家开发板坯、小方坯、圆管坯连铸机高效连铸技术的现状。

travelling round by the bus and tube is much more reasonable.
乘公交和地铁到处转就更合理了。
公共交通更方便 - SpeakingMax英语口语达人

Call it the shot heard round the tube.
FORBES: Magazine Article
The mortar round exploded in its firing tube during the exercise, said Brigadier General Jim Lukeman at a news conference at Camp Lejeune.
NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines
Still, a number of things could go wrong from a fuse malfunctioning, a problem with the barrel's assembly to a round prematurely detonating inside the tube, he said.
NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines