它省去了常规的称呼和信尾的客套话，但是要在本来该写称呼的地方增加一句表明信的内容的主题句。
It leaves out the conventional salutation and complimentary close, invariably containing a subject line in lieu of the salutation indicating what the letter is about.
次段写此类承诺形成的原因，在主题句后分两方面来说。
Such promises, absurd and ridiculous even at the first sight, come into being mainly for two reasons.
次段写此类承诺形成的原因，在主题句后分两方面来说。
Such promises, absurd and ridiculous even at the first sight, come into being mainly for two reasons.
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