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The discovery of stainless steel was the result of years of research by a well-known metallurgist who experimented with barrels made of steel alloys containing different percentages of chromium.

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Tens and thousands of years passed before wheels were used to make a vehicle.
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自信在学习、工作中的重要作用不言自明；2．自信完全不同于自负，它是建筑在个人的学识、判断和才智基础之上的。3．许多学者和职业人士，都强调自信在人生道路中的关键作用，这对于我们都有一定的启示作用。Self-confidence：An Important Factor for Success
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