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改变三角波电压波形的上升率或下降率，使其相差很多，就得到锯齿波发生电路。
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[音频]Directions: Listen to the recording and fill in the blanks with the exact words you hear.What would make you happy? Really happy? A nice holiday, lazing on a tropical beach? Maybe a blowout meal with friends at a swanky restaurant? Or possibly 1. ________ out on a pair of the latest designer jeans? All these pleasures cost money, so does that mean we need lots of cash to feel good or does the old saying 'money can't buy happiness' still 2. ________ true?This 3. ________ adage has been put to the test by scientists in Canada. They found that when used in the right way, money can bring us happiness. They discovered that when you use money to free up time, by paying someone to do your 4. ________ for example, you are happier. In an experiment, individuals reported greater higher life satisfaction if they used $40 to save time rather than spend it on material goods such as a new pair of shoes. But surprisingly, the researchers found that fewer than a third of individuals spent money to buy themselves time each month.In our hectic lives, time is one thing we seem to be short of. People are reporting a 'time famine', where they get stressed over the daily demands on their time. Psychologists say stress over lack of time causes lower well-being and contributes to anxiety and insomnia. But in many countries now, as incomes are rising, there is an 5. ________ to buy more time.This can be through hiring a cleaner to clean your house or outsourcing your ironing to someone else – giving us valuable extra hours to do the things we want to do. And in many forward-thinking companies, staff are given the opportunity to buy more time off or work 6. ________.Professor Dunn, who worked with colleagues at Harvard Business School, Maastricht University and Vrije Universiteit Amsterdam, says that "money can in fact buy time. And it buys time pretty effectively. And so my take-home message is, 'think about it, is there something you hate doing that fills you with 7. ________ and could you pay somebody else to do that for you?' If so, then science says that's a pretty good use of money.''I would agree that buying more time makes me feel happier and more relaxed. But making time a 8. ________ over making money does come at a price; you have less cash to spend on the things you now have time to do. However there's another old saying that 'life is short and time is 9. ________' so there's no time to waste and there's more to life than doing 10. ________ housework!
Directions: Match the English expressions with their corresponding meanings.
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