a.

1. 类似的；可比拟的[（+to/with）]
   The heart is analogous to a pump.

   心脏和水泵有相似之处。

2. 【生】同功的[（+to）]

adj.

1. comparable in certain respects.
2. Biology  performing a similar function but having a different evolutionary origin, such as the wings of insects and birds. Often contrasted with homologous.