mettlesome

The old men are mettlesome.

这些老人精神很好。

To follow Elon Musk's Twitter feed on Tuesday as SpaceX's Falcon Heavy rocket blasted off from its launch pad was to enter into the zany, geeky, mettlesome, and inspirational world of the South African-born tech entrepreneur.

私人太空公司SpaceX的猎鹰重型火箭（Falcon Heavy）周二从发射台升空时，关注埃隆·马斯克（Elon Musk）在Twitter上发的帖子就像进入了这位生于南非的科技企业家古怪、“极客范”、无畏而又鼓舞人心的世界。

Interesting! So Mid-Autumn Festival is in the middle of Autumn? In the chilly autumn wind, the soldiers set out with a mettlesome and handsome bearing.

真有趣。那么中秋节便一定是发生在秋天中间吧？秋风飒飒中，战士们英姿勃发地出发了。