Xiao Lin was refused to enter the deep pool because he was not wearing a swimming cap  Xiao Lin showed his deep water certificate and said, according to the regulations, I can enter the deep water pool
The rule of the swimming pool is that people who do not wear swimming caps are not allowed to enter the swimming pool; only those with a deep water certificate can enter the deep water pool
Those who are allowed to enter the swimming pool are not necessarily allowed to enter the deep water pool