Replacing an outdated HVAC system with a more energy-efficient one can lower your monthly energy bills.
用新的节能空调系统来替换过时的可以减少你每月的能源支出。
Regular exercise will make your heart and blood circulatory system more efficient, it will lower your cholesterol level, and also keep your blood pressure at a healthy level.
经常性的锻炼会使你的心脏和血液循环系统更有效率，它会降低你的胆固醇水平，并保持在一个健康的水平你的血压。
A lower number suggests your cardiovascular system is more efficient at only doing this.
一个低的心率表示你的心血管编制才具更强。
A lower number suggests your cardiovascular system is more efficient at only doing this.
一个低的心率表示你的心血管编制才具更强。
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