"十万人"用英语可以说作 "one hundred thousand people".
其中 "hundred" 是 "百" 的意思，来源于古英语 "hund"，"thousand" 是 "千" 的意思，来源于古英语 "þusend".
例句：
"There were one hundred thousand people at the concert." (演唱会上有十万人。)
"The city has a population of one hundred thousand people." (这个城市有十万人口。)
"It's estimated that one hundred thousand people will be affected by the flood." (洪水将影响十万人。)