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返回时,它们特有的觅巢行为就开始了,即在行走了大约10米远后,它们会在地上仔细地刻下指向蚁巢入口的标记。
When they made this return journey, they began their characteristic nest-searching behaviour, quartering the ground in detail looking for the entrance, after travelling about ten metres.
高能粒子激发100千米或更高处的氧原子,产生特有的绿色光辉。
To produce the characteristic greenish glow, the energetic particles excite oxygen atoms at altitudes of 100 kilometers or more.
中性氢辐射出离子化氢所没有的特有的21厘米波长。
Neutral hydrogen emits radiation on a characteristic 21cm wavelength, while ionised hydrogen does not.
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