词汇与表达：slug-sluggish-inactive-slog

slug
n.子弹，金属块；鼻涕虫；动作缓慢的人；[物]斯勒格，斯（质量单位）
vi.动作迟缓；偷懒
vt.重击；在…中插嵌片；偷懒



a sluggish economy
经济停滞
He felt very heavy and sluggish after the meal.
饭后他感觉身子很沉，不想动。
Some animals are inactive during the daytime.
有些动物白天不活动。

slog
There is little to show for the two years of hard slog.
两年的埋头苦干却没有获得什么值得炫耀的结果。

slug it out 决出胜负、一决雌雄