Cheeks--Well developed chewing muscles, but not so much that "cheekiness" disturbs the rectangular head form.

面合肌发达，但不能太夸张以至于变成“厚脸皮”，而破坏了矩形头的整体外观。

Duplicate the frame for second frame, unhide some of the hidden rectangles and hide some of the unhidden rectangles.

复制本图层，对隐藏的矩形进行修改，作为第二。

The influencing factors of coal arch camber in planomural coal bin and coal drop pipe with rectangular or circular cross section during coal drop are studied theoretically.

对落煤过程中平壁煤仓及截面形状分别为矩形、圆形的落煤管起拱的影响因素进行理论研究。