The uranium or plutonium isotopes are referred to as "fissile," which means we can use them to induce fission by bombarding them with free neutrons.

铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。

youdao

Unlike them, it has refused to sign the test-ban treaty. Unlike them, it declines to end the production of fissile material-uranium and plutonium-for bombs.

与五个核大国不同，它拒绝签署禁止核试条约，它拒绝中止核燃料(铀和钚)生产。

youdao

"The uranium or plutonium isotopes are referred to as" fissile, "which means we can use them to induce fission by bombarding them with free neutrons."

铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。

youdao

It did not win backing for new anti-proliferation obligations, such as a legally binding test ban or for an end to the further production of fissile uranium or plutonium for bombs.

ECONOMIST: Nuclear proliferation in South Asia: The power of nightmares | The

The reference to a test of a "higher level" could suggest North Korea has reached a point where it can test a weapon made from highly enriched uranium, rather than the plutonium fissile material used in its two previous tests.

WSJ: North Korea Plans Nuclear Detonation

North Korea is thought to have enough plutonium-based fissile material for as many as a dozen small bombs.

WSJ: North Korea to Restart Yongbyon Nuclear Plant