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句子是表达完整思想的一个语法单位。一个句子必须至少有一个独立分句。句子分为简单句、并列句和复合句。 简单句(a simple sentence)包括一个独立分句。 并列句(a compound sentence)包括两个或两个以上独立分句，分句之间由连接词来连接，如and，but，so。 复合句(a complex sentence)包括至少一个独立分句和一个从属分句。从属分句由从属连词引导，如 although, before。 简单句 Charles Parsons invented the steam turbine in 1884. In some forests, the soils are shallow and poor in nutrients. 并列句 Erika likes ruodern art, but she never goes to art museums. An electric bulb produces light, and a radio emits sound energy. 复合句 Although dogs are primarily carnivores, many will eat fruits and grains. The electric trolley had dominated city streets before buses took over.
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