While Ferrari are yet to score points, Brawn, Williams and Toyota all enjoyed strong pace at the opening two Grands Prix, with Brawn clinching two consecutive victories.

目前法拉利还未能取得积分，而布朗，威廉姆斯和丰田车队在本赛季前两站表现抢眼，布朗车队包揽了前两站的冠军。

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Ferrari and Toyota have previously threatened to quit the sport if a standard engine was to be introduced.

BBC: Cost-cutting plan agreed for F1

The McLaren car is the third to be unveiled ahead of the new season after Ferrari and Toyota's new models broke cover earlier this week.

BBC: Hamilton eyeing second title bid

But Button emphasised that other teams also had their own new parts to introduce in Spain - among them Red Bull, Toyota, McLaren, Ferrari and Renault, the teams that filled the remaining points positions in Bahrain.

BBC: Button expects close title battle