So someone returning from mass displacement, even though I'm sure [they] are thrilled to be going home, they bring with them all sorts of challenges upon their return.

经历过大规模迁移的人们返回家园时，尽管我可以肯定他们对于回家非常激动，但他们的回归也伴随着各种挑战。

youdao

Displacement - one of the main parameters that affects the mass of a ship.

排水量——影响船只质量的主要参数。

youdao

According to the law of mass conservation the incremental mass density can be inferred from the divergency of the scalar unperturbed mass density and the vectorial displacement field.

由质量守恒定律，质量密度增量来自未挠动的质量密度的散度和位移矢量场。

youdao

So someone returning from mass displacement, even though I'm sure are thrilled to be going home, they bring with them all sorts of challenges upon their return."

VOA: special.2011.07.06

There is little scientific dispute that if we do nothing, we will face more drought, famine and mass displacement that will fuel more conflict for decades.

CNN: Obama: 'Peace requires responsibility'