The word three is really hard to remember. In fact, it has a sacred meaning from the beginning, and it sounds like a saint. For example, San Francisco is called Saint Francis San Francisco. In the past, clergy had to dress neatly and were regarded as blessing others and making people healthy. SAN is a common root in English-SAN-= healthy, clean and sanitary. Sal and sanit are the same roots, so when you see these letter combinations, you must first associate knives with cleanliness, hygiene and health.
-ary is a common ending of adjectives.
Sanitarian means sanitary, clean and healthy.
If you use homophonic method, three = three = three means more in Chinese, and Ni = mud. A lot of mud has been cleaned up.