lists - Do I need to include "the" for each item in a text sequence

Can anyone please tell me that which is more appealing:

• My industrial collaborations at the national and the international levels.

• My industrial collaborations at the national and international levels.

What if the list has more than two items, like this:

Our contributions have impacts on the wireless industry, the application of IoT, the underwater channels, etc.

Do I need to add "the" before each item?