Think about bringing a pair of knee-high boots or a lowpair of heels so you can wear the shoes with both outfits.
尝试带一双及膝高筒靴或是一对低跟高跟鞋，这样就可以用一双鞋搭配两个场合的着装了。
2
The equivalence between theorem of equal angle of view and reversible property of lowpair, applied in synthesis of plane four-bar linkage, is demonstrated to reveal essence of their relation.
用几何法证明了等视角定理和低副运动可逆性在铰链四杆机构设计中的等价性，以求揭示它们之间的本质联系。
3
With the linear graph and adjacent matrix method of graph theory, the possible forms of this mechanism are discussed by analyzing that of kinematic chain with 4~8 links connected by planar lowpair.