(n)
a sudden event that causes very great trouble or destruction
thảm họa
They were warned of the ecological catastrophe to come.
Sustainable
(a)
causing little or no damage to the environment and therefore able to continue for a long time
có thể chịu dc lâu dài
A large international meeting was held with the aim of promoting sustainable development in all countries
Efficiency
(n)
when someone or something uses time and energy well, without wasting any
hiệu quả ( năng lượng)
What is so impressive about their society is the efficiency of the public services.
energy efficiency
Gradual
(a)
happening or changing slowly over a long period of time or distance
dần dần thay đổi
There has been a gradual improvement in our sales figures over the last two years.
As you go further south, you will notice a gradual change of climate.
Harness
(v)
to control something, usually in order to use its power
khai thác
There is a great deal of interest in harnessing wind and waves as new sources of power.
Fraction
(n)
a number that results from dividing one whole number by another, or a small part of something
phần nhỏ ( phân số)
¼ and 0.25 are different ways of representing the same fraction.
Although sexual and violent crimes have increased by 10%, they remain only a tiny/small fraction of the total number of crimes committed each year.
They can produce it at a fraction of the cost of (= much more cheaply than) traditional methods.
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