The customs in different countries are rather different. If I have dinner with a Chinese host, he always puts more food onto my plates as soon as I have emptied it. That often discomforts me greatly. I have to eat the food even if I don't want to, because it is considered bad manners in the West to leave one's food on the plate. I have already noticed that when a Chinese sits at an American's dinner party, he often refuses the offer of food or drink though he is in fact still hungry or thirsty. This might be good manners in China, but it is not in the West at all. In the United States, it is impolite to keep asking someone again and again or insist on his accepting something. Americans have a direct way of speaking, if they want something, they will ask for it. If not, they will say, “No, thanks.” When an American is fed with beer by the host, for example, he might say, “No, thanks. I'll take some diet, Pepsy-Cola(百事可乐) if you have it.” That is what an American will do. So when you go to the United States, you had better remember the famous saying: When in Rome（罗马）, do as the Romans do.

材料一：被誉为“中国航天之父”和“火箭之王”的著名科学家钱学森说：“六年的中学学习生活对我的教育很深，对我的一生，对我的知识和人生观起了很大的作用。”他归国后 到北京的第二天，就赶往母校探 望。每次路过母校，他都会说：“这是我非常熟悉的地方。”钱学森晚年曾称有17个人对他的一生影响深远，其中北京师大附中就有7位。

材料二：钱学森早年留学美国，他一直想着回国报效祖国，实现科技强国梦。他常说：“我的事业在中国，我的成就在中国，我的归宿在中国。”5年归国路，10年两弹成。为梦想，他披荆斩棘，奋力前行。面对困难，他鼓励身边的工作人员说：“常常是最后一把钥匙打开了神殿门，不要失去信心，只要坚持不懈，就终会有成果的。”