重要的因素是机床转轴系统的设计。
The important factor is the design of machine tool's spiale system.
要知道软件升级到可以预测撞击的确切经纬度绝非易事，因为切斯利每次都要将地球自传，方向及旋转轴等因素考虑在内。
Upgrading it to give the exact latitude and longitude of the collision wasn’t simple work, since Chesley had to factor in the spin, orientation and rotational wobble of the Earth at each moment.
形成季节的主要因素不是地球公转轨道的形状，而是地球自转轴的倾斜。
The tilt of the earth's axis, not the shape of its orbit, is what is responsible for the seasons.
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