Thechair has a ratchet below it to adjust the height.
这把椅子下面有一个棘轮来调整高度。
《柯林斯英汉双解大词典》
2
The frame of this lounge chair folds upon itself into seven different seating positions including the arm chair shown above and the chaise lounge and bench chairbelow.
这个躺椅框架折叠成七种不同的座位位置,包括扶手椅和躺椅和长椅。
3
Below you can see both HDRI Settings and camera Settings (almost default) used for the shoot where we see the swimming pool + chair.