Similarly , a 1989 study in france found that women who had sex infrequently or not at all had three times the risk of breast cancer compared to those who had sex more frequently-but the possible biological mechanism is less clear .
That is an interaction that goes on all the time while bubbles occur only infrequently .
这种相互作用一直都在进行,而泡沫仅仅是难得才出现一次。
It is easy to focus on common risks , or on events that have occurred in recent history , at the expense of events that occur infrequently but have major impact .
关注近期的一般风险或是普通事件是不难的,但代价则是忽略掉那些不常发生但影响较大的事件。
The reflexive interplay between imperfect markets and imperfect authorities goes on all the time while bubbles occur only infrequently .
不完善的市场参与者和不完善的当局一直都以反身性方式相互作用,而泡沫只是难得才出现一次。
They spend most of their lives in the canopy , descending only infrequently to mate , lay eggs , or change trees .
它们大多数时间都栖息在树冠上,只有在交配、产卵或换至另一颗树的时候才会偶尔下树。
And financial institutions who design these products and hedge them internally would be given the complicated task of asking customers for collateral for products that trade infrequently .
This means that when a bug strikes argentina it is met by a health system whose officials talk to each other infrequently , have different objectives , and dip into pots of cash of widely varying size .