慢速英语:维珍银河完成载客飞船的测试

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boundary – n. the edge or limit of something

curvature – n. something taking the shape of a round line

mannequin – n. artificial model made in the form of a human

deposit – n. money that you give someone when you agree to buy something

suborbital – adj. relating to or denoting a trajectory that does not complete a full orbit of the earth