extra heavy

基本解释

You may have noticed that you feel extra heavy, lethargic, that you feel gravity’s pull is greater.
你可能已經覺察到那時候的你感到非常沉重，昏昏欲睡，感覺地心引力都變得更大。
Along this line 20,000-ton coal trains can reach a length of over 7 km pulled by powerful electric locomotives over an extra heavy duty track and driving down operating costs.
大秦線上運行的兩萬噸運煤列車長度可達7公裡，由大功率電力機車牽引，大大降低了運營成本。
Though I lost weight by doing body building, I used to do three out of four sets with light weights, the fourth set was extra heavy just to make me feel good (see point below).
雖然我是通過健身法來減肥的，但我曾做四組力量訓練，前三組的重量輕，第四組要重——這衹不過是讓自己感覺幫一些罷了（見下一條）。

Discounts for big users are tiny because of the heavy extra costs imposed by the government to subsidise renewable energy sources (due to provide 20% of capacity by 2020) and to reduce the life of nuclear power plants to 32 years (from 50 years).
ECONOMIST: German business