Donor countries are becoming more choosy about which countries they are prepared to help.捐赠国在愿意帮助哪些国家的问题上越来越挑剔了。I'm very choosy about my clothes.我对自己的衣着很讲究。She’s very choosy about what she eats and drinks.她对吃喝非常挑剔。S...
The forebody design a key issue for hypersonic airbreathing vehicle.前体设计是吸气式高超声速飞行器设计的关键之一.It would reach hypersonic speeds -- five times the speed of sound.也就是说,要使飞机达到特超音速—即音速的五倍.hypersonic aerodynamics高超音速空气动力学rarefied...