“在…中”的英语？

杰夫在中学时参加了校内篮球赛。Jeff played intramural basketball in high school.这船从前航行在中国内河里.This boat was formerly used on the rivers of China.在中蓝色中加入蓝紫色就形成了一种格外鲜艳夺目的暖色。When violet is added to the medium blue a particularly striking, w...