visible flame的用法和樣例：
例句
- 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會發出可見的火焰，但可以通過在泄露點氧化物的積累來發現。 - To the left of the Horsehead Nebula, visible as the small dark indentation near the image top, is the photogenic Flame Nebula.
在左側的馬頭星雲，靠近圖像的頂部，可見小而黑暗的鋸齒狀物，那便是上鏡的火焰星雲。
