Much attention needs to be paid to the studies on side effects of iodine ard the safe upper limit of iodine intake.
过量碘摄入的负效应问题，以及磺摄入量的安全上限研究应当得到足够的重视。
The Institute of Medicine recommends 600 units a day for everyone from age 1 to 70 and 800 units for men and women 71 and older, with a safe upper limit for everyone over the age of 9 of 4,000 units.
医学研究院建议年龄1岁到70岁的每人每天600单位；超过71岁的人每人每天800单位；4岁以上的人每天摄取量的安全上限为4000单位。
But while higher is better from a fuel conservation perspective, there is an upper limit on how high it is safe to orbit humans for long periods.
越高耗费的燃料越少，而载人飞船能够长时间安全飞行的轨道高度就有上限。
No exercise recommendations across the globe mention an upper limit for safe exercise, but perhaps there is one.
目前，全球尚无有关安全锻炼的上限建议，但或许应该有一个。
The correction method is accepted by patients as it is safe, simple, economical without side effect, and upper limit of age.
此方法安全可行，且简便、经济、无副作用及年龄上限。
The correction method is accepted by patients as it is safe, simple, economical without side effect, and upper limit of age.
此方法安全可行，且简便、经济、无副作用及年龄上限。
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