But in 1990 several rate cuts failed to stop the American economy from sliding into recession.
但是在1990年，多次降息没能阻止美国经济陷入衰退。
2
Due to high speed, high viscosity pump inside the rotor is barely formed when running idle, surrounding medium by sliding, cause not feeding, or flow rate is small.
The wear rate initially increases and then decreases with sliding distance increasing in all tested materials, wear mechanism during dry sliding process is oxidation wear and adhesive wear.