closed two-dimensional manifold [数] 闭二维流形
open two-dimensional manifold [数] 开二维流形
smooth two-dimensional manifold [数] 光滑二维流形
compact two-dimensional manifold 紧致二维流形
The other is about the calculation and experiment of the two-dimensional unsteady turbulent flow in an exhaust manifold.
二是对排气管的二维不稳定湍流流动进行了计算和实验研究。
When the match between the unemployed and the vacant positions is efficient, the economic system described by a four-dimensional differential equation system has a stable two-dimensional manifold.
当失业工人和空闲职位的匹配是有效时，表示经济系统的四维动力系统存在一个稳定的二维流形。
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