Smiling is not always important in every situation. Sometimes, people just smile to be polite, not because they are really happy. In formal situations, like business meetings, people might not smile much and keep a serious face. Also, some people, especially with strangers, prefer not to smile and just stay serious.
微笑并不总是在每种情况下都重要。有时,人们只是出于礼貌微笑,而不是真的感到开心。在正式场合,比如商务会议上,人们可能不会经常微笑,而是保持严肃的表情。此外,有些人,尤其是在面对陌生人时,倾向于不微笑,而是保持严肃。