无需合同，无需承诺义务，可以随时取消。
There is no contract required, no minimum commitment and you can cancel it anytime
在WTO承诺义务限制的前提下，一些国家提高了关税。
There have been several instances of countries raising tariffs, within the limits of their WTO commitments.
在买方完全履行其合同义务前，WIRTGEN CHINA可以拒绝履行其保修承诺义务。
WIRTGEN CHINA may refuse to honour its warranty obligations as long as the Buyer has not fulfilled its contractual obligations.
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