通过观察海豚、驼背鲸和抹香鲸得知，促进鲸目动物通信进化的是一种在每代以及每个个体间传递鸣叫和强音的能力。
Fueling the evolution of cetacean communication is an ability, observed in dolphins, humpback whales and sperm whales, to pass songs and codas between generations and individuals.
虽然金属都是晶体组成的固体，但是在显微镜下观察时，这并不是一目了然的。
Although metals are crystalline solids, this is not immediately apparent when they are examined under a microscope.
透明设计在追求素雅的同时可以方便观察，让面包的状态一目了然。
Transparent design in the pursuit of elegance can be easily observed at the same time, so that at a glance the status of bread.
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