A laser beam passing through a jet of helium forms a stream of electrons, and a thin metal foil blocks their way.
激光束通过氦射流形成电子流，一层薄金属箔挡住了它们的去路。
Metal foil
原声例句
宇宙奥秘
英语百科
Foil (metal)
A foil is a very thin sheet of metal, usually made by hammering or rolling. Foils are most easily made with malleable metals, such as aluminium, copper, tin, and gold. Foils usually bend under their own weight and can be torn easily. The more malleable a metal, the thinner foil can be made with it. For example, aluminium foil is usually about 1/1000 inch (0.03 mm), whereas gold (more malleable than aluminium) can be made into foil only a few atoms thick, called gold leaf. Extremely thin foil is called metal leaf. Leaf tears very easily and must be picked up with special brushes.
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