气压中心后移使飞机失去平衡。The centre of pressure moves rearward and the aeroplane becomes unbalanced.大西洋上空的低气压通常给英国带来恶劣的天气.A depression over the Atlantic usually brings bad weather in Britain.气压表表明气压在继续下降.The barometer marked a cont...
方法:椎间盘部分置换的植入物由聚合水凝胶 ( 乙烯醇 ) 组成,并且被做成棒状的形态.Methods . The implants for partial disc replacements were made of poly ( vinyl alcohol ) hydrogel and rod - shaped....