失去活力的英文：
harden into stone
To lose vigor,brilliance,or liveliness.
失去活力，失去光泽，不快乐
A man's mind can rot in prison.
在狱中，人的头脑会失去活力。
"The tiny natural holes in the skin, pores, then become blocked with oil and dead skin."
皮肤上细小的毛孔就被这种皮脂和失去活力的皮肤组织所堵塞。
v. （使）变硬；（使）变冷酷，变严肃；（使）变坚强，变坚定；变稳定
hardened and tempered
淬火与回火的
These are the seedlings that are hardening off in a hotbed
这些是放在温床中经受耐寒锻炼的幼苗。
There they cool and harden into volcanic ash.
然后在空中它们又冷却变成火山灰。
prep. 进入…中；进入…状态；持续到；输入
stone是什么意思：
n. 岩石，石头，石料；石块，宝石，钻石；果核；英石（英国重量单位）
v. 向（某人）扔石块，用石头砸；去掉果核
Level the city stone by stone to an extinct waste.
一块石头一块石头地夷平该市，使它成为一片没有人烟的荒原。
And then he continued to dig for his son, stone by stone.
然后继续挖掘，掀开了一块一块的石头寻找他的儿子。
The lane to the garden was overlaid with stones.
通往花园的小径上铺了一层石子。