共晶铝硅合金活塞顶部直径有两次突然长大，而过共晶铝合金活塞仅有一次。
The crown diameter of eutectic al Si alloy piston has increased suddenly in twice, but the hyper eutectic al Si alloy piston only once.
据英国《每日邮报》1日报道，罗马万神庙顶部有一个直径30英尺的大洞，数个世纪以来，这个洞的用途一直让人甚为困扰。 不过。
The huge 30ft hole built into the dome of Rome’s Pantheon has mystified minds for centuries.
巢建云杉，两旁的头发或切碎树皮，外观粗糙，体积大，直径达1.5米（ 5英尺）可以构造顶部的悬崖或树上。
Nest built by asperata, lined hair or shredded bark, the appearance of rough, bulky, diameter up to 1.5 meters (5 feet) can be constructed on top of a cliff or a tree.
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