黯然神伤

Yes, why should a butterfly as it used to be only the ugly caterpillars and feeling very depressed.

是的，一只蝴蝶何必要为它曾经是只丑陋的毛毛虫而黯然神伤。

Already known in the Cyclades around 2500BC. According to Mythology Pan fell in love with the waternymph Syrinx. She ran away from him and when she could not cross the river Ladon to escape she asked Artemis to help her. Just as Pan was about to embrace her, Syrinx changed into cattail reeds. Pan holding the marsh reeds sighed in disappointment, causing the wind to blow through the reeds. He was enchanted by the sound, believing it to be the mournful cry of his beloved Sytinx; He produced a set of pipes so that he could have her with him always.

据古希腊神话所述，潘神爱上了水中女仙Syrinx，而Syrinx却不喜欢他，当她准备离开的时候被一条河挡住了去路，进而请求河神Artemis帮助她逃跑，正当潘神准备拥抱她的时候，Syrinx变成了一堆芦苇，正当潘神握着芦苇黯然神伤时，风刮过芦苇吹出了声音，他被这美妙的声音打动，并坚信这声音是他深爱的Syrinx哀伤的哭泣，于是他拔下这些芦苇做成了潘神管，那样Syrinx就可以永远陪伴他了。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。