共同 + Verb / 共同 + 的 + Noun
共同 (gòngtóng) means "jointly," "together," or "common" and can function as an adverb or adjective. As an adverb, it modifies a verb to indicate that an action is done collectively. As an adjective, it describes something shared or mutual, as in 共同利益 (common interests).
我们需要共同努力才能完成这个任务。
Wǒmen xūyào gòngtóng nǔlì cái néng wánchéng zhège rènwu.
We need to work together to complete this task.
保护环境是我们的共同责任。
Bǎohù huánjìng shì wǒmen de gòngtóng zérèn.
Protecting the environment is our shared responsibility.
两家公司共同开发了这款产品。
Liǎng jiā gōngsī gòngtóng kāifā le zhè kuǎn chǎnpǐn.
The two companies jointly developed this product.