English translation for "doubling of the track"

铺设第二线, 双线化

Similar Words：

"doubling of frequency" English translation, "doubling of line" English translation, "doubling of sheets" English translation, "doubling of the bow" English translation, "doubling of the image" English translation, "doubling of volume" English translation, "doubling on itself" English translation, "doubling over test" English translation, "doubling piece" English translation, "doubling piece = tilting fillet" English translation