toughens

v.

（使某物[人]）坚韧，坚强，强硬( toughen的第三人称单数 )；

toughen up困难，使强壮

1. This experience will toughen her.
   这次经历会让他变坚韧。
2. The company leader said that army life would toughen the recruits up.
   连长说军队生活可以使新兵锻炼得更坚强。
3. All this mountain climbing will toughen the boys up.
   这些爬山运动会把孩子们锻炼得身强体壮。

DOE TOUGHENS SECURITY PLAN
Addison Toughens Car Stereo Ordinance
European union toughens antismoking stance.
Global Fund Toughens Stance Against Corruption
China toughens its restrictions on use of the internet
ION IMPLANTATION PROCESS TOUGHENS METALWORKING TOOLS
Lactic Acid Prices Falter as Competition Toughens
EPA Region 6 toughens toxic stance; no-notice inspections will increase. (Environmental Protection Agency)
Revamped Law on case for city; Corporation Counsel toughens strategy to cut tort liability costs; gains are still small.(News)
Biological organization of hydroxyapatite crystallites into a fibrous continuum toughens and controls anisotropy in human enamel