These thematic pictures of 大自然 are analogous to a visual dictionary. The theme "大自然" splits into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so the information is absorbed better. Especially it is true if you are using flashcards to learn the chinese(Simplified) language, which is not your native language.
To expand your chinese(Simplified) language vocabulary on the "大自然" topic, flashcards games are the best way: