1·Remember: there is no official upper limit to how much a person can spend in a lifetime.
记住，一个人一生能花多少钱，没有官方上限。
2·That suggests there is some kind of upper limit to how much people can or should pay attention.
这儿有些建议说，在人们所能或者所应该得到的注意力集中程度是有上限的。
3·That is the usual upper limit of the noise of wind rustling through bushes and of the murmurs of an audience, which might have drowned the actors out.
这是风吹过灌木或者一位观众窃窃私语所发出声音频率的上限，通常就是因为这些声音会将表演者的声音淹没。
4·This parameter defines the upper limit for network kernel buffers.
这个参数定义了网络内核缓冲区的上限。
5·The size of other columns in the same table can further reduce this upper limit.
同一个表中其他列的大小可以进一步减少这个上限。