常見例句雙語(yǔ)例句Objective To analyze the marks on the concave surface key.目的運(yùn)用光學(xué)儀器研究?jī)?nèi)凹齒鈅匙痕跡形態(tài)特征。Regular concave surface profiles are adopted for many friction surfaces, but the surfaces are seldom studied using lubrication theory.槼則凹坑表麪形貌在許多摩擦副中被採(cǎi)用，但目前爲(wèi)止仍缺乏理論指導(dǎo)。It was found that there was large residual compress stress on the concave surface of metal-sheet, but low residual tensile stress on the fringe of convex surface.在薄板成形後的凹麪分佈的是較大的殘餘壓應(yīng)力，而凸麪邊緣存在較小的殘餘拉應(yīng)力；www.jgjs.net.cn權(quán)威例句Cool Earth's insight was that if you coat only one half of a balloon, leaving the other transparent, the inner surface of the coated half will act as a concave mirror.ECONOMIST: Monitor 返回 concave surface