慢速英语:Sleep Expert Tells Students All-Night Study Hurts Performance

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approach - n. a way of dealing with something

especially - adv. more than usually

cram - v. to prepare for a test by trying to learn a lot of information quickly

counterproductive - adv. not helpful

attach - v. to fasten or join one thing to another

recommend - v. suggest

irregular - adj. not normal

distress - n. feeling unhappy or pain

comfortable - adj. producing physical comfort