短语词组短语unwanted alarm 无用报警unwanted fire 害火unwanted shifting 不必要的变速unwanted mode 不要的振荡unwanted sideband 干扰边带unwanted child 被遗弃的儿童unwanted voltage 无用电压unwanted radiation 无用辐射unwanted enantiomers 非目标对映体 返回 unwanted