(in emails, social media, etc. from the abbreviation for ‘laugh out loud’) used to express fun, laughter or the feeling that something makes you smile（用于电邮、社交网站上的评论等，表示逗乐、大笑或好玩）
The dog kept running around chasing its tail. Lolz.那只狗一直追着自己的尾巴转圈跑。真逗！
We've come a long way since that pic. Lol!自那张照片以来，我们已经走了很长一段路。大声笑！