尽管如此，我面对这种来自跑步穿越美国的挑战比以前更有信心了。
Despite that, I am much more upbeat about this challenge of running across America than I was.
美国航空航天工业遭到了一些强劲竞争产品的挑战。
The American aerospace industry has been challenged by some stiff competition.
他们很快就掩饰掉亚裔美国人面临的挑战和不公。
They're quick to gloss over the challenges and injustices that Asian Americans have faced.
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