branching

分支（的）

The connection of separate parts of a branching system to form a network, as of leaf veins, blood vessels, or a river and its branches.

并接，联结分支系统的不同部分结合后形成一个网络，如叶脉，血管，或河流及其支流

His mind kept branching off into the contemplation of side issues.

他的脑子老是岔开去想一些枝节问题。