I forgot posting here about what I learned in English class on July 16.
・Vocabulary
compost
prune (verb)
patio
slug
Patio is one of the hardest concept for Japanese to understand. That's because vast majority of them cannot afford to create space for patio, due to high population density.
In some cases, patio can be a sightseeing spot with entrance fee. It shows how rare patio is in Japan.