Balance Equilibrium in Chinese / Japanese...

均衡 means balance or equilibrium.

This title is best for a Japanese audience where the word suggests that your life is in balance in all matters (or is a reminder for you to try and keep all matters in balance).

自然界の均衡 is a verbose way to say “nature in balance” in Japanese.

The first three Kanji have the meaning of “the natural world” or “the natural kingdom” (kind of like the animal kingdom but including plants and all things biological).
The third character is a Hiragana that acts to connect the two ideas here.
The last two Kanji mean equilibrium or balance.

This 平衡人生 title suggests that you are actively trying to keep your life in balance.

Think of this as the action verb of seeking or having a balanced life.

The first two characters mean balance, equilibrium, or keeping things equal.

The last two characters mean “life.” Literally “human life.”

宇宙平衡 is a proverb that is simply Universe Balanced (we might say “Balanced Universe” in English).

The first two characters mean the Universe. However, in some contexts, it can mean cosmic, cosmos, or outer space.
The second two characters mean balance or balanced (can also mean equilibrium).