Cách sử dụng
'Hardening' means to become tougher or stronger. It can be used in different situations like hardening of a substance, hardening of muscles, or hardening of steel. For example, when food is cooked, it can get harder or tougher. This is known as hardening. Similarly, when someone exercises, their muscles can become hardened, making them stronger. In a more technical sense, hardening can also be used to describe a process of making something more resistant to damage or wear and tear. For example, a metal can be hardened by heating it and then rapidly cooling it down to make it stronger.Overall, 'hardening' is a word used to describe things becoming tougher or stronger, both in physical and metaphorical senses.