fixed needle traverse [测] 固定指针导线
Japanese machine-gunners often set up their guns in a fixed position, and do not traverse and search.
日本机枪手经常把机枪摆放在固定位置，并不穿越和搜寻。
The other is simplified crack model, which is used to describe the traverse crack, estimate approximately the free face farther field effect and match with the 1-D fixed shape wave.
其二描述直管的横向裂缝，建立了估算裂缝自由面远场效应、并与一维定型波模型匹配的简化裂缝模型。
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