给几个例句你自己体会其中的意思:1、go through trails and tribulations 经受艰难困苦的磨练2、temper oneself in a hard struggle 在艰苦的斗争中磨练自己3、The difficulty is the best helper for steeling will 磨练意志最好的帮手是困难4、undergo a long process of tempering 经过长期的磨练5、go through trails and tribulations 经受艰难困苦的磨练