探索
 venture 冒险、冒昧 may i venture to ask you a question, sir
 risk 冒险 you should not have risked the confrontation with the government
 probe 探查 the detective probed into the circustances of the murder
 explore 探险、探索 the adventurer explored a dangerous underground cave
 seek 寻找、探求 we sought an answer to the question but could not find one
 grope 摸索Tom groped around in the dark until he found the light switch
 ferret 搜索the detective finally ferreted out the criminal