1. Respiratory quotient (RQ) The ratio of the volume of carbon dioxide evolved during respiration to the volume of oxygen absorbed: RQ=volume CO2/volume O2 . 呼吸商（RQ）：呼吸作用中参与反应的二氧化碳的体积和吸收氧气的体积之比。即RQ=体积CO2/体积O2。
2. Please give me two fifty dollar bills and five twenty dollar bills. 请给我两张五十美元的钞票和五张二十美元钞票。
3. Usually the U. S. dollar will result in dollar-denominated commodities such as oil prices fell, because investors holding other currencies more expensive for the oil change. 美元走强通常将导致以美元计价的石油等大宗商品的价格下跌，因为对持有其他货币的投资者来说石油变贵了。
4. Keep a Dollar or Give a Dollar? 保留一美元还是给与一美元？
5. Every extra dollar they have to spend because of high gas prices is one less dollar they can use to put food on the table. We'd , pay the round on matter mortgagees. rent or meet their mortgages. 他们为高油价多支付的每一美元，都是从他们的膳食费、房租或支付抵押贷款的钱中扣除出来的。
