这些微小的东西构成了食物链的基础，并在全球碳循环中发挥着重要作用。
These tiny things form the base of the food chain and play an important role in the global carbon cycle.
由此而来的是城里学校缺少富裕的税收基础而经费不足，恶性循环开始了。
Consequently city schools lack a wealthy tax base and are short of money. A cycle begins.
他们认为每一个所谓的基础粒子实际有一个更小的，振动着的，一维循环的弦。
They propose that each so-called fundamental particle actually contains a tiny, vibrating, one-dimensional loop of string.
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