Changes of nuclear mass and nuclear size cause isotope shifts.

原子核质量和大小的不同引起同位素移动。

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Overall the tumor cells are fairly uniform in nuclear size and shape.

总得来看肿瘤细胞的细胞核大小形状一致。

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The nuclear size of spermatocytes in other stages did not exhibit any conspicuous changes.

精母细胞其它各期核的大小无显著变化。

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Cutting the size of the nuclear arsenal to a small fraction of its Cold War size and focusing on terrorists rather than state-based threats may seem sensible in the present environment, but the decisions the administration is making will have consequences for decades after it leaves office.

FORBES: Nuclear Weapons: How Few Is Too Few?

Since 1981 we've been committed to seeking fair and verifiable arms agreements that would lower the risk of war and reduce the size of nuclear arsenals.

CNN: State of the Union Address

Israel, itself the possessor of a nuclear arsenal of unknown size, is also watching closely and is quite capable of taking unilateral action if it feels threatened as the destruction of the Iraqi reactor in 1981 showed.

BBC: Nuclear threat casts global shadow