One of the more important qualities one must possess to be able to comprehend what is written is prior knowledge or experience. If you have been aware of the subject or have some knowledge of it then comprehending what is written is a piece of cake. I have a poor knowledge of dining and I find I am not able to relate to names of food items easily. So, whenever I see some information on food I find it difficult to comprehend. For instance, I do not know what gelato is. I always thought it was jelly! Later, I looked the word up in the dictionary and found out what it meant.
You may be better off than me and you may know what gelato is. However, if you are finding difficulty in understanding some words it is better to consult a dictionary and learn the new word. Once you have learnt the new word the next time you see it, of course, it is not new. It will be in your interest to try and read something new as much as possible to improve your vocabulary and reading skills. Here is one passage that may be new to you: