我用梦寐以求的停车位换来了健身俱乐部免费的会员和五次每月往返经过亚特兰大交通系统的执照。
I exchanged my coveted parking spot at work for a free gym membership and five monthly round-trip passes on Atlanta's mass transit system.
更糟的是，该方法还需要对管理货币的系统进行三次往返。
Worse, this approach also requires three round trips to the system in charge of the money.
开展低成本运载火箭、新型上面级、天地往返可重复使用运输系统等技术研究。
China will conduct research into the technologies for low-cost launch vehicles, new upper stage and the reusable space transportation system between the earth and low-earth orbit.
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