Terms for subject Watchmaking containing metal

English	Chinese
The metal one is durable	金属的经久耐用
Titanium is as strong as steel but nearly half as light, which makes it a highly desired—and also very expensive—metal	钛和钢一样坚硬，却只有钢一半的重量，这使得它成了一种急需而价格昂贵的金属