- harden up
- 使: send; tell sb. to do sth.
- 坚硬: hard; solid; stiffness; rigi ...
- 坚硬: hard; solid; stiffness; rigidity; flintiness 坚硬的岩石 solid rock; rag; 坚硬度 flintiness
- 使坚定: confirm; corroborate; stouten
- 使坚固: bind; consolidate; corroborate; firm; harden; indurate; rivet; ruggedize; stouten; strengthen
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