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。

youdao

Caster is the forward or backward tilt of the spindle or steering the knuckle at the top when viewed from the side.

连铸机是向前或向后倾斜的主轴或督导节在顶部时，从一侧。

youdao

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。

youdao

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