实质性变更 meaning in English

materially alter

A purported acceptance dispatched by the offeree which materially alters the terms of the offer constitutes a new offer
受要约人对要约的内容作出实质性变更的，为新要约。
If the employer intends to make any material change to his financial arrangements , the employer shall give notice to the contractor with detailed particulars
如果雇主欲对其资金安排做出任何实质性变更，雇主应向承包商发出通知并提供详细资料。
A change in the subject matter , quantity , quality , price or remuneration , time , place and method of performance , liabilities for breach of contract or method of dispute resolution is a material change to the terms of the offer
有关合同标的、数量、质量、价款或者报酬、履行期限、履行地点和方式、违约责任和解决争议方法等的变更，是对要约内容的实质性变更。
An acceptance containing nonmaterial changes to the terms of the offer is nevertheless valid and the terms thereof prevail as the terms of the contract , unless the offeror timely objects to such changes or the offer indicated that acceptance may not contain any change to the terms thereof
第三十一条承诺对要约的内容作出非实质性变更的，除要约人及时表示反对或者要约表明承诺不得对要约的内容作出任何变更的以外，该承诺有效，合同的内容以承诺的内容为准。