Its successful reasons are joint result of specific external cause and internal cause.
其成功原因是特定的外因和内因紧密结合的结果。
Black steel case, snap-in plastic lens, brass internal, connection and joint.
黑铁壳，扣入式塑面，铜机芯，铜管子，铜接头。
Black steel case, snap-in plastic lens, brass internal, connection and joint.
黑铁壳，扣入式塑面，铜机芯，铜管子，铜接头。
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