stiff resistance meaning in English

强有力的抵抗
顽强抵抗

They could no doubt have offered a stiff resistance if attacked .
他们在受到攻击时，可以顽强抵抗，这是无可怀疑的。
The army encountered stiff resistance from rebels in the hills
军队遭遇到山里的造反者强烈的抵抗。
And despite their green - friendly intentions , inventors are finding some of the stiffest resistance is coming from environmental groups
尽管发明者有友好的意图，但他们还是受到了来自环保组织的僵硬的阻力。