So if we place a relatively low mass object here, it will maintain a constant distance from the massive bodies pulling on it.
因此，如果我们在这里放置一个质量相对较小的物体，它将与吸引它的巨大天体保持恒定的距离。
英语百科
Reflexive operator algebra
（重定向自Distance constant）
In functional analysis, a reflexive operator algebraA is an operator algebra that has enough invariant subspaces to characterize it. Formally, A is reflexive if it is equal to the algebra of bounded operators which leave invariant each subspace left invariant by every operator in A.