Renewal，强调重新指定法律关系或用一新合同取代旧合同。即合同的“续签”或“重新签订”。如：His contract is coming up for renewal.他的合同快到续订期了。
Renewal：the re-creation of a legal relationship or the replacement of an old contract with a new contract,as opposed to the mere extension of a previous relationship of contract
Extension，强调指同一合同或契约延续一定规定期间的效力。即合同的“展期”或“延长的期限”。如：It is also required an extension to your visa. 你的签证也需要延期。
Extension：An extension is an extra period of time for which something lasts or is valid, usually as a result of official permission.
The increase resulted from contracts from new customers and the renewal of a few long-term contracts from existing customers.
As regards the proposal in the motion that the Government formulate standard contract terms and require all service providers of regulated services to adopt them, so as to protect consumer rights and avoid possible disputes, the Liberal Party is of the view that so long as the standard contract covers the major and crucial terms, for example, the arrangements for contract termination and automatic contract renewal, and so long as service providers are allowed to retain some flexibility, support can be given to this proposal.
While the complainant requested an extension of a deadline for his response to the State party’s observations on the merits with a justification of the need to seek further evidence from his contacts in the Democratic Republic of the Congo, he did not submit any new documents that would help to substantiate his allegations.
Consistent with its obligation not to provide source or special fissionable material, or equipment or material especially designed or prepared for the processing, use or production of special fissionable material to any non-nuclear weapon State for peaceful purposes unless the source or special fissionable material is subject to IAEA safeguards, and with decision 2, paragraph 12, of the 1995 Non-Proliferation Treaty Review and Extension Conference, with the exception of India, Canada will only authorize nuclear cooperation involving proliferation significant items with those non-nuclear-weapon States that have made an internationally legally binding commitment not to acquire nuclear weapons or other nuclear explosive devices and that have accepted IAEA safeguards on the full scope of their nuclear activities.