The materials of tube for loading particles and the load height have less effect on the apparent mass burning rate.

装填药粒用的壳体材料和药粒装填高度对传火速度的影响不显著。

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CAMBRIDGE Mass. - Most research on renewable energy has focused on replacing the electricity that now comes from burning coal and natural gas.

马萨诸塞州剑桥市——大多数关于可再生能源的研究都集中在取代通过燃烧煤矿或天然气生产的电力。

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CAMBRIDGE, Mass. - Most research on renewable energy has focused on replacing the electricity that now comes from burning coal and natural gas.

马萨诸塞州剑桥市——大多数关于可再生能源的研究都集中在取代通过燃烧煤矿或天然气生产的电力。

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So the question of how many extra calories you should eat to gain muscle mass depends on how many calories you are burning each day.

CNN: How should I eat to build muscle mass?

When the bishop of Dijon was burning Santas, most Frenchmen still went regularly to mass.

ECONOMIST: Spoil the French and spare the Child

Before I answer your question, let me clarify that while metabolism does drop with age (about 3 percent per decade) due to muscle loss and hormonal changes, it does not drop with exercise, but rather increases due to direct calorie burning during your workouts and indirectly through an increase in muscle mass as a result of your workouts.

CNN: What's the best way to 'kick-start' my metabolism?