The flow of asylum-seekers depends in part on the level of instability in the more troubled areas of the world.
寻求庇护者的涌入，部分原因取决于世界上更加动荡的地区的不稳定水平。
2
The fact that this instability exists means that very soon after a fracture opens, fluid flow begins to focus along tiny ripples and build some bigger channels at the expense of others.
The fact that this instability exists means that very soon after a fracture opens fluid flow begins to focus along tiny ripples and build some bigger channels at the expense of others.