A light wooden frame on runners, used by children for coasting over snow or ice.

装在滑行装置上的车辆，用于运载人或货物通过冰面或雪地；雪橇。

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It can guarantee the coasting body not over-sink or over-float with the support of light-load spring under light load and heavy-load spring under heavy load.

轻载时由轻载弹簧支承，重载时重载弹簧加入承重，保证惯性体不会超限下沉或上浮；

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You can also buy a car that shuts down one or more engine cylinders when it is coasting, or cruising under a light load, reducing fuel consumption without sacrificing performance.

FORBES: 10 Ways Automakers Are Helping You Spend Less On Gasoline