她手掌上的老茧是因为长期做园艺活磨出来的。

The ___callouses on her palms came from years of gardening work.

多年的攀岩让她的指尖长满了老茧。

Years of rock climbing ___calloused her fingertips.

多年的战争报道让这位记者对悲剧变得麻木不仁。

Years of war reporting have ___hardened the journalist to tragedies.