All five remaining tiger subspecies are endangered, and many protection programs are in place.
现存的5个老虎亚种都濒临灭绝，因此很多保护项目都在紧锣密鼓的进行中。
It is one of five biggest relay protection manufacturers in the world.
全球五大继电保护生产厂商之一。
It is one of five biggest relay protection manufacturers in the world.
全球五大继电保护生产厂商之一。
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