同学你好，该知识点来自沪江网校《法语零基础至中级（0-A2）VIP【1V1定制30课时】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，

appear的意思是看来好像；似乎，
https://dictionary.cambridge.org/search/direct/?q=appear
to seem
看来好像；似乎
You've got to appear (to be) calm in an interview even if you're terrified underneath.
在面试时，即使内心很怕，也要显出很镇定的样子。
To people who don't know him he probably appears (to be) rather unfriendly.
在不了解他的人看来，他可能很不友好。
Things aren't always what they appear to be.
事情并不总像表面看上去的那样。

in one's late thirties 表示在三十多岁的晚期，就是38、39岁的样子。
https://dictionary.cambridge.org/dictionary/english-chinese-simplified/late

整句话的意思是他看上去三十八九岁的样子。

学习愉快！