front line (n phr)
the most visible or important position in any situation 最前線；戰線
The president is usually on the front line in any big problem.
homage (n)
a sign of deep respect and often praise shown for someone or something 敬意；尊敬
Martin Luther King Day is a day for Americans to pay homage to a great leader in the civil rights movement.
subset (n)
a small group that is contained within a larger group (集體中的)小項或亞組
Children are a subset of the many different people in our community.
niche (n)
a specialized area that is exactly suitable for a particular thing 利基；合適的地位
The computer company couldn't grow because only a small niche of people were able to use its products.
renewable (adj)
describes a form of energy that can be produced again as it is used 再生的；可更新的
The sun and wind are sources of renewable energy
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