to progress or improve very quickly
非常に速く進歩または改善する (hijō ni hayaku shinpo mata wa kaizen suru)
"Her English has improved by leaps and bounds."
"彼女の英語は急速に改善されました。" (kanojo no eigo wa bai rīpusu ando baundosu de shinpo shimashita)
To openly show your emotions or feelings.
to recover after an illness or difficulty
to make a very serious promise that something is true
to tease or joke with someone in a playful way
a balance between two conflicting or competing factors
a mysterious or unexplained force in a system or person
