We have brought this transaction to a successful conclusion.
我们已成功地达成了协议。
Generally speaking, a contract cannot be changed after it has been signed by both parties.
一般来讲,合同一经双方签订就不得更改。
On turning eagerly to the text, one learns that the lady was a typist who found the sound of office typewriters worried her more and more until eventually she had to go into a mental hospital.