尽心的英文：
with one one's heart

参考例句：

She was just playing the devoted mother.
她只是装得像个尽心尽责的母亲似的。

Though uncertain that anyone were to blame, she found fault with every absent friend
尽管她不知道这该不该埋怨别人，但她归咎于每一个不尽心的朋友。

I was wondering how to repay you for your goodness in teaching her: now this gives me a chance to show my appreciation.
"此刻正思向蒙训教之恩未经酬报,遇此机会,岂有不尽心图报之理."

one是什么意思：
num. 一；同一个、最重要的一个
det. 代替a或an，表示强调；某位（用于不太熟悉之人的姓名之前）
pron. 任何人；一个人；一个事物；其中的一个人

One, Taipei, one way.
台北单程票一张。

This one is not a spoof.
这个就不是开玩笑了。

One and one make(s) two.
一加一等于二。

One must drink as one Brews
自作自受

The voice of one man is the voice of no one
一个人的声音是没有力量的

heart是什么意思：
n. 心，感情，热忱，内心，中心，红桃

They exchanged their views heart to heart.
他们推心置腹地交换了意见。

Distance is naught while heart with heart can meet.
心心能相印，距离等于零。

get/learn by heart
记住,背诵

boxed heart check
心材开裂,成材心裂

His heart stopped beating.
他的心脏停止了跳动。