如果你用一块具有较强磁力的颚型磁铁，然后把液氧倒在颚型磁铁的中间，氧气会停在颚型磁铁中。

If you take the jaws of a powerful magnet and pour liquid oxygen in between the jaws, the oxygen will stop and will sit in the jaws.

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士的宁用于杀灭啮齿动物，而吡咯里西啶类生物碱则具有较强的杀菌活性。

Strychnine is used to kill rodents and pyrrolizidine alkaloids have significant activity against microbes.

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在这种情况之下，约束并不具有较强的限制性。

In this case, the constraints should be less restrictive.

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And, in fact, if you take the jaws of a powerful magnet and pour liquid oxygen in between the jaws, the oxygen will stop and will sit in the jaws.

实际上，如果你用一块,具有较强磁力的颚型磁铁,然后把液氧倒在颚型磁铁的中间，氧气会停在颚型磁铁中。

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