持久性有机污染物能在环境中存在许多年，长距离传播，并通过食物链累积，造成的损害不仅限于生产和使用它们的地方，而是在全世界范围。
POPs persist in the environment for many years, travel long distances and accumulate in the food chain causing harm not only where they are produced and used, but globally.
也使用气泵，但作用仅限于在管道中制造半真空，以减小胶囊运行的阻力。
Air pumps are involved, but their role is limited to creating a partial vacuum in the pipes in order to reduce resistance to the capsules' movement.
该问题不是仅限于容器管理的实体 bean 的使用中，而是普遍存在于面向对象方法中。
This problem is not limited to the use of container-managed entity beans but is general to the object-oriented approach.
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