复数： summiteers

His father used to climb with british mountaineer chris bonnington , and his grandfather , a yak traderwho toured the world with everest 's first summiteer , sir edmund hillary .

他父亲经常和英国登山家克里斯伯宁顿（chrisbonnington）一起登山，而他的祖父是位牦牛商人，曾和登上珠穆朗玛峰的第一人埃德蒙希拉里爵士周游世界。