聽課
課程多端同步更新，充分利用零碎時間。做題
海量精選試題，想練就練，瞬間提分。答疑
網(wǎng)校名師24小時在線答疑解惑。直播
名師大咖面對面，有問有大收獲多。Some of us feel well-rested after a solid eight hours of sleep. For others, closer to nine feels best. For others still, a little less will do. How much sleep we prefer to get is highly subjective -- but how much sleep we need is a bit more concrete.
我們中的一些人，睡足了8個小時后覺得無比神清氣爽。對于另一些人來說，睡差不多9個小時為最佳。還有一些人，稍微不足這點時間剛剛好。我們更愿意睡多久是非常主觀的——但是我們需要多少睡眠就是有那么一點具體有形的了。
After web analytics showed the vast popularity of the How Much Sleep Do We Really Need? feature of the National Sleep Foundation's (NSF) website, a panel of experts set about to reassure that the information provided there was the most accurate and up to date.
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