脑细胞一旦遭到破坏，就不能再生。
一旦适应了，我就非常喜欢上学了。
一旦杂质沉淀下去，油就可以定级了。
一旦让她父亲发现了，就会发生争吵。
你一旦核对了所定货物，就把该记录存档。
Once you've checked off the items you ordered, put this record in your file.
大多数电线一旦弯曲变形就恢复不了原状。
Once most wires are bent out of shape, they don't return to the original position.
我不希望一旦我暂时离开，这份工作就不保。
I'd hate to think my job would not be secure if I left it temporarily.
一旦你撕开瓶子的封口,就没法将它重新合上。
Once you've broken the seal of a bottle there's no way you can put it back together again.
灰尘袋是一个过滤器，一旦太满吸力就会减弱。
Dust bags act as a filter and suction will be reduced if they are too full.
一旦他们的部队撤出2/3，经济制裁就会解除。
Economic sanctions will be lifted once two-thirds of their forces have pulled out.
一旦尘埃落定，贝克就为自己的决定进行了辩护。
美国军队做好了充分准备，一旦总统下令就采取行动。
U.S. forces are fully prepared for the execution of any action once the order is given by the president.
政府还没有真正充分考虑一旦战争结束它打算做什么。
The administration has not really thought through what it plans to do once the fighting stops.
一旦灌木开始把小植物完全覆盖，我们不得不将它们移走。
Once the shrubs begin to smother the little plants, we have to move them.
我在这儿什么人都不认识，但我确信一旦站住脚就会应付过来。
I don't know anyone here but I am sure I will manage when I find my feet.
一旦出现坏疽，组织就会坏死，那么惟一的希望就是抑制其损害。
Once gangrene has developed, the tissue is dead, and the only hope is to contain the damage.
一旦有了定期的飞机航班，乘坐远洋客轮出差就变得不切实际了。
Once there were regularly scheduled airlines, it became impractical to make a business trip by ocean liner.
那么，一旦我们同居了，为何我们中的许多人就觉得有必要结婚呢？
So, once we have cohabited, why do many of us feel the need to get married?
一旦你体验过南加州的户外生活，再要回到蒙大拿过冬就会感到很难。
Once you have tasted the outdoor life in southern California, it's hard to return to Montana in winter.
一旦确认有了耳疾，就难以治愈。
Once an earing disorder has become firmly established, there is no easy cure.
一旦你错过了，你就永远错过了。
一旦你得到了这些气体你会怎么做呢？
但一旦我们弄清楚它是什么，就重建它。
漏斗云一旦接触到地面就会变成龙卷风。
一旦它进入土壤，植物会通过根部将它吸收。
Once it's in the soil, plants absorb it through their roots.
一旦森林覆盖开始增加，灭绝的速度应该变小。
Once forest cover does start increasing, the rate of extinction should dwindle.
一旦大型发行机构合并，芯片成本应该就会下降。
Once large issuers convert together, the chip costs should drop.
一旦这种情况发生了，歌剧表演的主题也会开始改变。
Once that happened, the themes of the opera presentations also started to change.
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