第一个that是必须的,因为它是主语从句的连接词.
第二个that是宾语从句的连接词,完全可以省略.
问题补充：enjoy surfing能改成are enjoying surfing?------可以的.
这里用两个that好不好However,it is clear that the picture also shows
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it is clear that… 这个句型对吗?