Forward tilt is negative caster and backward tilt is positive caster.

连铸机倾斜向前为负，落后倾斜是积极的连铸机。

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Mars, in contrast, has a wildly oscillating tilt and chaotic seasonality, while Venus, rotating slowly backward, has virtually no seasonality at all.

相比之下，火星有着剧烈的倾斜和混乱的季节性，而金星则缓慢地向后旋转，几乎没有实质上的任何季节性。

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The pilot can tilt the helicopter forward, backward, or to either side.

飞行员能使直升机向前倾斜，向后倾斜，或者向两侧倾斜。

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As it falls, it ejects two tungsten ballasts, a hundred and sixty-five pounds each, which tilt it backward to create lift.

NEWYORKER: The Martian Chroniclers

While you're looking at the screen, you can tilt the phone backward or forward to scroll up and down.

CNN: Hands-off with the Samsung Galaxy S IV