炉火渐纯青

Both Xiao Qian and Lilac are fluent in English. Good examples I may never catch up with.

炉火渐纯青
征程挥鞭紧
骏马奋蹄驰
云开远山明

Becoming pure blue fire
Journey with whiplash tight
A horse is galloping
The clouds scattered to see 
the mountain's shine