We
Allegedly
Then we spent 900 thousand years learning to make and use tools;
Again another 90 thousand years getting acquainted with fire and its usefulness;
Again 9 thousand years becoming gradually experienced in farming;
Again 9 hundred years acquiring the skills in building machines...
But in this century, the present hundred years,we've learned flying;
Achieved the use of nuclear energe-the ultimate energy we can ever tap,
And succeeded in landing on the moon.
It's said that we'll eventually be able to retain vitality against aging.
We have boundless abilities and potentialities.
So let us be blessed.
相关单词：vitality
vitality解释：n.活力，生命力，效力
vitality例句：
He came back from his holiday bursting with vitality and good health.他度假归来之后，身强体壮，充满活力。
He is an ambitious young man full of enthusiasm and vitality.他是个充满热情与活力的有远大抱负的青年。
相关单词：boundless
boundless解释：adj.无限的；无边无际的；巨大的
boundless例句：
The boundless woods were sleeping in the deep repose of nature.无边无际的森林在大自然静寂的怀抱中酣睡着。
His gratitude and devotion to the Party was boundless.他对党无限感激、无限忠诚。
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