Working in steel and concrete, they made Bridges, cars, skyscrapers and moonrockets that worked well and satisfied their human users.
靠着钢铁和混凝土,他们做出了优异的桥梁、汽车、摩天大楼和登陆月球的火箭,让使用者深感满意。
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But up close, it's huge: about 327 ft. (100 m) tall, or the biggest thing the U.S. has launched since the 363-ft. (111 m) Saturn V moonrockets of the early 1970s.