三种实施方式 : It is actually one embodiment, so called "the first 实施方式" gives top level concept for claim 1, so called
"the second 实施方式" and "the third 实施方式t" each gives a way to connect 上盖 to 盖体 之 轉軸 through the 上盖 之 開口,
there is no other way to do it.