美国人的生活方式表现出人们非常尊重他人的时间。当人们计划一项活动时，他们通常会在几天或几个星期前把时间定好。时间一旦决定，除非情况紧急，一般不会 轻易改变。如果有人想去你家看望你，他们通常会先打电话问清楚这是否方便。只有很熟的朋友才会不约而至。此外，人们也不太喜欢太晚给人打电话，因为怕对方 可能已上床睡觉了。何时才算太晚并不一定，不过，大部分的人若想在晚上10点钟以后打电话，都会再三考虑。
American lifestyles show how much people respect the time of others. When people plan an event, they often set the time days or weeks in advance. Once the time is fixed, it takes almost an emergency to change it. If people want to come to your house for a friendly visit, they will usually call first to make sure it is convenient. Only very close friends will just “drop by” unannounced. Also, people hesitate to call others late at night for fear they might be in bed. The time may vary, but most folks think twice about calling after 10:00 p.m..
(Source: wwenglish.com)