1.indigenous a.土产的，本地的(native)

词根记忆：来自indigene(n．土著)

例：indigenous population of America美洲的土著居民

2.indigent a.贫穷的(impoverished)

联想记忆：in(不)+dig(挖)+ent--挖不出东西的--贫穷的

例：The indigent family lived under a bridge.

3.indirect a.间接的；迂回的(not direct)

词根记忆：in（不）+direct(直接的)--不直接的--间接的

例：Biocontrol agents are likely to have indirect as well as direct adverse effects on nontarget species.

派生词：indirectly( ad.间接地)

4.indiscriminate a.不加区别的(not marked by careful distinction）；不受限制的(unrestrained)

词根记忆：in（不）+discriminate(区别)--不加区别的

例：Bill is quite indiscriminate in his choice of clothing.

派生词：indiscriminately( ad.不分皂白地，不加选择地)

5.indispensable a．必不可少(absolutely necessary)

词根记忆：in（不）+dispensable(可有可无的)--不是可有可无的--必不可少的

例：Satellites are indispensable in the identification of weather patterns.