His development (or retrogression) was rapid.His muscles became hard as iron, and he grew callous to all ordinary pain.He achieved an internal as well as external economy.

• 他的提高（或者说是退化）是迅速的，肌肉变得钢铁般坚硬，对一般的疼痛都麻木了，他内部跟外部同样经济实用。