Today, we know the nature of shadow as the optic phenomena, but in our perceptions shadows still remain associated with some mystery.
如今，我们知道影的本质是一种光学现象，但是影给人的感觉仍旧是与某些神秘相关联。
2
Nowadays, though, most are associated with a combination of phenomena including overfishing, warmer waters and, often, the washing into the sea of farm fertilisers and sewage.
然而现在，大多数赤潮与包括过度捕捞、海水升温和经常被冲入海里的农用肥料和污水的联合作用有关。
3
Switching phenomena with an associated negative resistance region have been observed in the current-voltage characteristics of lead oxide film sandwiches.