To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.
失去一个父母可以看成是一种不幸；失去双亲看上去就像是一种粗心了。
The study of mathematics is the indispensable basis for all intellectual and spiritual progress.
The most dangerous phrase in business is 'We've always done it this way.'
写作是一种乐观的行为。