Middle-class Americans still enjoy more luxury than upper-class Americans enjoyed a century earlier, and the fin de siècle was not an especially gloomy time.
现在的中产阶级比一个世纪前的上层阶级享受到更多的奢侈品，而十九世纪末期并不是一个特别的阴暗年代。
2
They are cobalt-blue on top and silvery-white below, with a pronounced dorsal fin and a long, lethal, spear-shaped upper jaw.
它的顶部是钴蓝色，下面和银白色；有着明显的背鳍，还有着长长的、能致命的矛状上颚。
3
To replace the relief valve disc, hold the upper guide fin and unscrew the diaphragm pressure plate.