The wall is projected in the middle.
这

在中部凸出。
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三册 These are characterized by broad, flat rotating disks of stars, gas, and dust; a central bulge of older, redder stars, sometimes with a long cylindrical or rectangular bar of stars as well; and a huge extended halo of older stars.
它们是由恒星、气体和尘埃组成的宽而平的旋转盘;由较老的、较红的恒星组成的中央凸出部分,有时也有长长的圆柱形或长方形的恒星条,还有一个巨大的古老恒星光晕。