Birds store energy as subcutaneous fat deposits or "body reserves"; changes in these reserves can be reliably estimated by measuring changes in body mass.

鸟类以皮下脂肪沉积或“身体储备”的形式储存能量；通过测量体重的变化，可以可靠地估计这些储备的变化。

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They store the energy mechanically by rotating mass around an axis.

它们通过质量绕轴旋转机械存储能量。

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The desert is a perfect place to store the mass of steel, because low humidity and rainfall means very little rust occurs.

由于沙漠湿度低、雨量少，很少诱发锈蚀现象，因此是存储大量钢铁的理想之地。

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Collectively, these businesses design, produce and sell greeting cards and other related products, such as gift bags and party supplies, through numerous distribution channels, including mass merchandisers, drug store chains, discount retailers, card and gift retailers, and supermarkets.

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The beauty of oversized format bottles is that they are fun and festive in their own right, the kind of thing you are only opening for company or celebrations, and the wine itself hardly matters, with the exception of some mass-produced warehouse store or budget wines that are occasionally sold in magnums.

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That is all right with Jeff Mayersohn, owner of the Harvard Book Store in Cambridge, Mass.

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