Tokyo 's tap water , where iodine turned up friday , now has caesium as well .
周五时从东京的自来水中检测到放射性碘，现在出现了放射性铯。
Atomic clocks rely on regular oscillations of caesium atoms to keep time and are extremely accurate .
原子钟依靠铯原子的均匀振动记录时间，故而十分准确。
What is more , caesium particles tend to lurk in the grass , which means radiation is more of a risk at toddler height than for adults .
更近一步说，粒子往往潜伏在草地中，这就说明比起成年人，蹒跚学步的孩子受到辐射影响的风险更大。
But in a setback that delayed the plan by about a week , water leaked on thursday from a facility used to absorb caesium .
但是，因为周四遭遇挫折，水从用来吸收铯的设备中泄露，计划被推迟了约一个星期的。
Japan 's nuclear and industrial safety agencyestimates that the emission of radioactive iodine and caesium from the fukushima plant totals , to date , something equivalent to 370 petabecquerels .
