The tragic history of colonial people, the endless conflict between major powers, especially the two world wars, have left painful lessons in the history of mankind.
殖民地人民的悲惨历史，大国间连绵不断的冲突，特别是两次世界大战，都给人类留下了沉痛的历史教训。
All that fretting and worrying teaches you nothing, but experience, the constant trainer, provides you with an endless stream of lessons and ideas for new projects and new directions.
因为所有的恐惧害怕都不能教会你任何东西，但是经验，不断的练习却可以带来无尽的教训，提供新的主意并指引新的方向。
Long hours and endless repetition of dry lessons yields little tangible result in terms of ability to use the language.
超长的学习时间，无休止地重复枯燥的课程，实际上对提高英语的应用能力收效甚微。
Long hours and endless repetition of dry lessons yields little tangible result in terms of ability to use the language.
超长的学习时间，无休止地重复枯燥的课程，实际上对提高英语的应用能力收效甚微。
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