Thus our bodies continuously exchange old substance for new, just like a spring which more or less maintains its form and movement, but in which the water molecules are always different.
因此，我们的身体不断地把旧物质替换成新的，就像一个喷泉，或多或少地保持着它的形式和运动，但其中的水分子总是不同的。
Whether in winter or summer, spring or autumn, it's always got its fun and its excitements.
无论在哪个季节，它总有自己的的乐趣和兴奋。
It's always worth learning the pros and cons of working for an agency and freelancing, because each has its perks! Here are a few that spring to mind.
了解设计公司和自由职业各自的优缺点总是有价值的，因为特有特点。以下是我想到的。
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