随时: 1.(任何时候) at any time; at all times 短语和例子你有问题, 随时可以来问我。 if you have any questions, you can come and ask me at any time. 他随时都可能到达。 he may arrive any instant. 机器应该随时注意维护。 machinery ought to b
核反应和电离辐射的量和单位: quantities and units of nuclear reactions and ionizing radiations