Is it acceptable to use contractions in formal writing?

在正式写作中使用缩略形式可以吗？

同一单元的其他句子

• Translation is not merely a word-for-word substitution but a cultural exchange.翻译不仅仅是逐字替换，而是一种文化交流。
• Writing a good translation requires a deep understanding of both languages.写好翻译需要对两种语言有深刻的理解。
• Can you identify the main idea of this passage before translating it?翻译之前你能识别出这段文字的主旨吗？
• The translator must pay attention to the context and tone of the original text.译者必须注意原文的语境和语气。
• Do not translate idioms literally; find equivalent expressions in the target language.不要直译习语，要在目标语言中找到对等的表达。