At least one kind of building block is polygon prism blocks which have grooves to fit for the protrusive arris or have grooves to fit for protrusive arris on the main shell body.
在积木拼块中，至少包括一种是多边形柱体拼 块，该拼块的每一侧边上设有可与主壳体凸棱相楔合凹槽，或设有可与主壳 体凹槽相楔合的凸棱。
Instead of the solid block of glass of the prism in pentaprism system, here 3 simple mirrors are used to perform the same task.
五面镜不是用一整个玻璃棱镜，而是用3块镜子来达到相同的目的。
The shape of block stones shall be close to straight prism or regular quad or polygons.
块石形状应接近直棱柱体，或有规则的四边形或多边形。
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