烘云托月[hōng yún tuō yuè]
词典“set off the moon with clouds” -- art of using contrasting effect
词典paint clouds to set off the moon：烘云托月。
词典provide a foil to set off a character or incedent in a literary work
烘云托月[hōng yún tuō yuè]
（比喻从侧面加以点染以烘托所描绘的事物） “set off the moon with clouds” -- art of using contrasting effect; paint clouds to set off the moon; provide a foil to set off a character or incedent in a literary work