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1·The contract violates a mandatory provision of any law or administrative regulation.

违反法律、行政法规的强制性规定。

2·Visitors will note the almost mandatory provision of a miniscule electric jug, or kettle, in every hotel room.

游客们会发现，每个酒店房间都有一个小型电热水壶或茶壶，这几乎是一项强制规定。

3·This text thinks that the contract about preselling of commercial housing without preselling license violate the mandatory provision.

无预售许可证商品房预售合同违反了法律的强制性规定，但这并不导致此类合同必然无效。