慢速英语:Obama Announces Clean Power Program

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Plan B – n. idiomatic phrase. a plan in case something bad happens; an alternative plan

challenge – n. a difficult task or problem; something that is hard to do

solar – adj. produced by or using the sun's light or heat

shutter(ed) – v. to close (a business or store) for a period of time or forever

lifeblood – n. the most important part of something; the part of something that provides its strength and energy

disproportionate – adj. having or showing a difference that is not fair, reasonable or expected; too large or too small in relation to something

barely – adv. hardly or scarcely; used to say that something was almost not possible or almost did not happen

income – n. money that is earned from work, investments or business

moral obligation – n. an obligation arising out of considerations of right and wrong; the social force that binds you to the courses of action demanded by that force

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