visible flame

• 可见火焰

visible flame的用法和样例：

例句

1. Some very small leaks will not give a visible flame but may be detected by the presence of oxide buildup at the leak point.
   一些非常少量的泄露不会发出可见的火焰，但可以通过在泄露点氧化物的积累来发现。
2. To the left of the Horsehead Nebula, visible as the small dark indentation near the image top, is the photogenic Flame Nebula.
   在左侧的马头星云，靠近图像的顶部，可见小而黑暗的锯齿状物，那便是上镜的火焰星云。