(cause sth) become hard, strong, unyielding, etc.
make sb less sensitive (to sth)
"The wax hardened"
"The cold hardened the butter"
"This trip will season even the hardiest traveller"
"He was inured to the cold"
The rise of a lawyer class was everywhere hardening customary into written rights.
出自： J. R. Green
The statues..spotted black, green and yellow with clots of hardened moss.
出自： W. Wharton
岩浆冷却后凝成岩石。 harden sth into sth
Harden one's revolutionary will into steel.
洋葱苗长壮后,我们就可以把它们移植到菜园里; 这些苗很快就可以移植。 harden sth ⇔ off
What is the best way to harden off new rose bushes only a few inches high?
Potted plants should be hardened off before planting out.
他很早就习惯了犯罪生涯。 harden sb to v-ing
Do you think that John is becoming hardened to failing his driving test?
Poor people often become hardened to suffering.
穷人常常变得能忍受苦难。 harden sb to sth
They've been hardened to the horrors of war.
He became hardened to the suffering around him.