elephant tusk, ivory. 大象的牙 象牙

A worker removes elephant tusks from a pile in the secure strongroom, to be logged and carried outside into shipping containers for storage, at the headquarters of the Kenya Wildlife Service (KWS) in Nairobi, Kenya, April 4, 2016. Around 105 tonnes of ivory are due to be burned later this month, the largest single destruction of ivory in history according to the KWS, to coincide with the Giants Club summit for the protection of elephants which will be held in Kenya April 28-30. (AP Photo/Ben Curtis)
Photos of the day - April 4, 2016
https://www.yahoo.com/news/photos/photos-of-the-day-april-4-2016-1459784158-slideshow/photos-of-the-day-april-4-2016-photo-1459784581608.html