介绍:
SpaceX rocket in historic upright landing
unmanned adj. 无人的；无人操纵的；
orbit n. 轨道；眼眶；- CET4
upright adj. 正直的，诚实的；垂直的 - CET4
vertically adv. 垂直地 - CET4
feat n. 功绩，壮举 - TOEFL/IELTS
slash v.削减 - CET6
debris n. 碎片，残骸 - TOEFL/IELTS
tumble v. 摔倒；倒塌；滚动 - CET6
US company SpaceX has successfully landed an unmanned rocket upright,after sending 11 satellites into orbit.
The Falcon-9 craft touched down late on Monday night, about 10km from its launch pad at Cape Canaveral, Florida.
It is not the first spacecraft to land a booster vertically; that feat was claimed by the much smaller New Shepard rocket in Texas last month. Nonetheless the Falcon-9 flight, which also went twice as high as New Shepard, is a milestone towards reusing rockets.
SpaceX aims to slash the cost of private space operations with such reusable components - but the company has not launched a rocket since one exploded in June. On that occasionan unmanned Falcon-9 broke apart in flames minutes after lifting off from Cape Canaveral, with debris tumbling out of the sky into the Atlantic Ocean.
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