N a type of plastic explosive 一种塑胶爆炸物 [美国英语]
C4 has an impressive new boss in David Abraham, who will surely seek change.
第四频道在大卫阿拉伯罕有一个令人印象深刻的新上司，他肯定会寻求改变。
But some plants, including maize and sorghum, have evolved to use a type called C4.
但是一些植物，包括玉米和高粱，进化成了使用C4型的光合作用。
Notice that the third evolution had two consecutive Construction iterations (C3 and C4).
注意到第三个演进有两个连续的构建迭代(C3和C4)。
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