那位科学家在困难时从不灰心丧气。
The scientist from whom … never lost heart when he was in trouble.
当你遇到苦难与挫折时，无论你在何地，请不要灰心丧气，因为在你的背后是强大的祖国——美利坚合众国。
When you encounter suffering and frustration, no matter where you are, please do not discouraged, because you are behind the strong motherland - the United States of America.
当你遇到苦难与挫折时，无论你在何地，请不要灰心丧气，因为在你的背后是强大的祖国——美利坚合众国。
When you encounter suffering and frustration, no matter where you are, please do not discouraged, because you are behind the strong motherland - the United States of America.
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