Err on the side of sth寧愿稍微過一點to show slightly too much rather than too little of a quality

When I am marking exam papers, I always try to err on the side of generosity.
改考卷打分時,我寧肯寬一點.
I thought it was better to err on the side of caution(= to be too careful rather than take a risk).
我認為寧可過于謹慎也不要冒風險.

set your heart/mind on sth,或者是on doing sth.意思就是一心想要某物(或做某事),立志要
when she was a small girl, her heart was set on a horse of her own.
她還是個小女孩時就特別想要一匹屬于自己的馬.

He set his mind on becoming a doctor.
他立志要成為一名醫生.

I have my heart set on a new guitar.
我一心想要一把新吉他.