Middle-income blacks are downwardly mobile. Why?

黑人中产阶级正在不断下滑，为什么？

Real after-tax incomes fell 0.1% in July, compared with a downwardly revised 0.1% gain in disposable incomes for June.

扣除所得税之后的个人真实收入，在7月份下跌了0.1%。 而相较于6月份，尽管处于下降趋势中，调整过之后的当月可支配收入仍旧有0.1%的增长。

The mill casing is provided with a downwardly aligned cylindrical collar which may be axially adjusted to set a grinding gap between the rotor and the mill casing.

所述磨机外壳配备有向下对准的柱形轴环，所述柱形轴环可以被轴向调 整以设置所述转子与所述磨机外壳之间的研磨间隙。

The handle can include an upper portion defining a distal section connectable to the cutting blade assembly and a lower portion extending downwardly from the upper portion.

手柄可包括一形成连接到切割刀片组件的远端部分 的上部和一从上部向下延伸的下部。

On the contrary, the radial gradient of axial velocity decreases downwardly along the axial direction. Therefore, the axial velocity distribution becomes horizontal gradually.

轴向速度的径向梯度沿轴向向下逐渐变小，轴向速度分布也逐渐趋于水平直线状。

An ejector arm on the coffee brewer engages an ejector blade on the lower cartridge shell and biases the lower coffee shell downwardly to eject the used coffee cartridge into a used cartridge bin.

咖啡泡制器上的 弹射臂与下盒壳上的弹射片接合，且使下盒壳向下偏移来将用过的咖 啡盒弹射到用过的盒仓。