1. Their life cycle helps man provide himself with a basic food—fish. 鱼类的生命周期使其成为一种人类的基本食物。
2. We can see how the product life cycle works by looking at the introduction of instant coffee. 通过观察速溶咖啡的推行，我们可以看到产品生命周期是如何运作的。
3. For a brief moment during that stage of its life cycle, the tongue consists of two tiny half-tubes before merging into one. 在它生命周期的这一阶段，有短暂的一刻，其舌头由两个微小的半管组成，随后融合为一体。
4. Those European and North American young then return to their respective coasts to begin the unusual life cycle of the eel anew. 那些欧洲和北美洲的幼鱼随后回到它们各自的海岸，重新开始鳗鱼独特的生命周期。
5. The importance of the product life cycle to marketers is this: different stages in the product life cycle call for different strategies. 产品生命周期对营销人员的重要性在于：在产品生命周期的不同阶段需要采取不同的策略。
