The difference between 激烈 and 强烈
We use both of these adjectives to emphasize the high intensity of a feature or phenomenon. However, we should use them in different contexts.
The adjective 激烈
We use the adjective 激烈 
to emphasize tension or resistance between two sides.
to emphasize tension or resistance between two sides.Examples
那是活动激烈的时期
It was a time of intense activity
nà shì huódòng jīliè de shíqí
快餐业竞争非常激烈
The fast food industry is incredibly competitive
kuàicān yè jìngzhēng fēicháng jīliè
双方陷入了激烈的争论
Both sides got into a fierce debate
shuāngfāng xiànrù le jīliè de zhēnglùn
The adjective 强烈
We use the adjective 强烈 to emphasize strength and determination as well as a high degree or concentration of something.
For example, we use this adjective when we want to emphasize intense emotions, feelings, light, or color.
to emphasize strength and determination as well as a high degree or concentration of something.
For example, we use this adjective when we want to emphasize intense emotions, feelings, light, or color.Examples
银行强烈反对降低利率
Banks strongly oppose lowering interest rates
yínháng qiángliè fǎnduì jiàngdī lìlǜ
他们已招致强烈非难
They have drawn strong criticism
tāmen yǐ zhāozhì qiángliè fēinàn