例句與造句

1. Both problems were solved before the completion of the Manhattan Project at the end of 1946, the former by the development of the more effective gaseous diffusion technology, the latter by employing uranium and plutonium together in a composite core for an implosion-type nuclear weapon.
2. The service chiefs insisted on a yield of between 10-12 kt for two reasons : firstly, to minimise usage of scarce and expensive fissile material; and secondly, to minimise the risk of predetonation, a phenomenon then little understood, and the primary reason for using a composite core of concentric shells of plutonium and U-235.
3. It's difficult to find composite core in a sentence. 用composite core造句挺難的
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