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a. 额外的，附加的11 次
requires extra operational spending.
需要额外的运营开支。
Emission-free modelling demands extra funding.
零排放建模需要额外资金。
ask authors to include extra citations.
要求作者加入额外的引用。
agree to pay extra for the national parks.
同意为国家公园额外付费。
It has become a grimly reliable annual ritual: every January the cost of travelling by train rises, imposing a significant extra burden on those who have no option but to use the rail network to get to work or otherwise.
这已成为一项令人沮丧却雷打不动的年度惯例：每年一月，乘火车出行的费用都会上涨，给那些别无选择、只能靠铁路网上班或出行的人带来了沉重的额外负担。
It could make extra training and instruction affordable.
它可以让额外的培训和指导变得负担得起。
n. 附加物，额外的东西1 次
Therefore, everyone needs to find their extra — their unique value contribution that makes them stand out in whatever is their field of employment.
因此，每个人都需要找到自己的额外价值——即能让自己在所从事的任何领域中脱颖而出的独特贡献。