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| 1. | Either of two mackerel sharks of the genus Isurus, characterized by a large heavy body and a nearly symmetrical |
| 灰鲭鲨，尖嘴鲭鲨任一种属于鲭鲨属的鲭鲨，特点是具有硕大沉重的身体和近乎对称的尾巴 |
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| 2. | When an object shape is nearly symmetrical and the non-symmetrical part has been shown clearly by other |
| 可将投射方向一致的几个对称图形各取一半（四分之一）并成一个图形。此时应在剖视图附近标出相应的剖视图名称。 |
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