科学家们指出，快餐店不仅要降低食品的能量密度，而且要缩小食品的体积。
Fast food outlets should reduce the energy density of their menus as well as their portion sizes, the scientists said.
锂电池具有体积小、能量密度高、无记忆效应、循环寿命高、高电压电池和自放电率低等优点。
Li battery have the good features of small size, high power density, no memory effect, long cycle life, high voltage and low self-discharge.
科学家们指出，快餐店不仅要降低食品的能量密度，而且要缩小食品的体积。
Fast food outlets 7 should reduce the energy density of their menus as well as their portion sizes, the scientists said.
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