in the (inner) most recesses of the soul [heart]
在心灵的最深处 [心底]
speak one's mind; say one's mind
坦率地说出心底的话
I do love you, with all my heart.
我还是从心底里爱你，
who hast brought the gold and purple of heart,
你从心底掏出的宝藏，
Dobbin owned in his heart was very welcome.
都宾心底里也觉得高兴。
And you believe at heart, everyones a killer.
于是你从心底相信，每个人都是杀人犯。
They really buy them?
他们真是打心底里想买吗？
He seems bad-tempered but he's very soft-hearted underneath.
他似乎脾气很坏, 其实心底里很善良.
Underneath, her feelings are very mixed.
心底里，她的情感是复杂的。
I felt as though I'd been struck a blow under the heart.
我感到心底仿佛受到一击。
Watch out for their leavings."
当心脚底下牛粪。”
Mind your step!
小心走路!留神脚底下!
What were the Americans really up to?
美国人到底居心何在？
He was determined to face it out.
他决心把这事坚持到底。
He was not at all nervous, for he knew what to expect.
他心里有底, 一点不慌。
Center of radius at bottom front to center of radius at top rear
底前半径中心到顶后半径中心
(of a cartridge) fired by striking the center of the base.
（指弹药筒）通过撞击底部的中心来发火。
Once he was home, however, his anxiety passed.
但到了家时，冯云卿到底心定了。