恰到好处表达的同时，要注意语法、标点符号和拼写是否正确，此外，采用合适的语气会有助于达到目的。
Correctness means not only proper expressions with correct grammar, punctuation and spelling but also appropriate tone which is a help to achieve the purpose.
仔细检查基本语法、拼写、大写字母、标点符号、表达和语气等。
Be very careful of basic grammar, spelling, capital letters, punctuation, expression and tone.
无论何种方式的商务信函都应注意语气、态度、用词和符号的选择以及商务套语。
Attention should be paid to the tone, attitude, choice of words, signs and cliches, which will be explained with examples in the thesis.
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