Cities, if unrestricted, tend to coalesce into bigger and bigger conurbations. [VERB prep.]

如果不加限制，城市往往会联合发展成越来越大的集合城市。

His sporting and political interests coalesced admirably in his writing about climbing. [VERB]

他在写登山的文章中，把自己对体育和政治的兴趣完美地结合了起来。