From summer to winter, every Saturday 8am has started our Chinese class time. I have been admiring these two engineers who, after a week of hard work, were able to get up early to learn Chinese, no matter how bad the weather was and how cold and heat it was. Today I taught them the word "xīnkǔ：hard work". They told me "Teacher，we appreciate your hard effort", and I said "it’s me appreciate your hard effort." You say "we do but we are very happy", I think it's worthy anyway now.