周三在世界羽联世界巡回赛香港公开赛首轮比赛中林丹出局，获得东京奥运会的参赛资格对他来说是个艰难的挑战。请看本报周五的报道：

China’s Lin Dan said he expected an uphill battle to qualify for the Tokyo Olympics after crashing out in the first round of the Hong Kong Open on Wednesday.

The former world No. 1 had the backing of a raucous crowd against top-ranked Kento Momota, who was left flat-footed in the second game before wearing out Lin in the decider 21-19, 12-21, 21-15 in 76 minutes.

“I’m a bit sorry for the third game. There were two unforced errors that I made that changed the lead,” Lin said afterwards.

报道中的an uphill battle就是“艰难的挑

战”，例如：

Android’s multiple devices and form factors make designing for it an uphill battle.

安卓的多样的设备和形式因素让设计安卓软件成了一个艰难的挑战。