Englishfor English speakers
energy
Noun
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Energy is the ability to do work: move, give off heat, give off light, etc.
Unlike coal or oil, atomic energy production creates little air pollution.
Higher electricity prices should help promote energy efficiency.
The amount of energy in 100g or 100ml of food is much higher for foods with a lot of sugar.
She's all full of energy and she can't sit still.
This problem has taken up most of her time and energy for over a year.
barrier
Noun
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A barrier is something that stops passage; it does not allow anything to get through it.
The barrier across the road stopped traffic from getting past it.
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A barrier is an obstacle; it is something to prevents progress.
The bug in the code was a barrier to us completing the project on time.
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A barrier is a boundary or limit.
The wall surrounding the jail was a barrier to all those who want to get out.