ren when denying a specific request which is thought to be unreasonable.
have a problem with有问题
20 It's the cheerfulness and lack of hesitation that impress upon the child that parents mean what they say.
impress sth.on/upon sb./one's mind/memory使某人对…
…明确无误，使铭记在脑海/记忆中
eg：The manager impressed upon the salesmen the importance of creating new markets.
经理使每个推销员深感到开辟新市场的重要。
