The primary arc beads and the secondary arc beads are the important evidence for identification of the cause of fire during airplane electrical fire investigation.
一次短路电弧熔珠和二次短路电弧熔珠是飞机电气火灾原因鉴别的重要物证。
More rarely, a secondary rainbow is seen, which is a second, fainter arc, outside the primary arc, with colours in the opposite order, that is, with violet on the outside and red on the inside.
更罕见，被认为是次要的彩虹，这是第二个，暗弧，外弧的首要，在相反的顺序的颜色，这是紫的，红的外面，里面。
The season finale leads into a multi-part arc featuring Bane as the primary foe for the Jedi heroes.
第二季最后以一个多集故事结尾，其中，贝恩是绝地英雄们的主要对手。
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