地球是“宇宙射击场”中的一个靶子，容易随机遭遇各种猛烈的撞击事件，这在数十年前从未受到过怀疑。
Earth is a target in a cosmic shooting gallery, subject to random violent events that were unsuspected a few decades ago.
宇宙射线撞击大气时，也会直接产生成对的质子和反质子。
Pairs of protons and antiprotons are also directly produced in the cosmic ray collisions with the atmosphere.
宇宙射线撞击地球，携带着大量的高能粒子；其能量是现存最大加速器所产生能量的4千万倍以上。
Cosmic rays bombard the Earth from space and include particles of astounding energy, 40m times more powerful than anything that physicists can create in the world's biggest accelerators.
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