The molecules join together to form long strings.

　　分子連接在一起形成長(cháng)串。

　　She gave up her job to join her husband's campaign.

　　她辭了工作以參加丈夫的競選活動(dòng)。

　　He chose to join the company as a market researcher.

　　他選擇加入這家公司當一名市場(chǎng)研究員。