有时候，用户可能希望只根据一个可用的选择条件对数据排序，而将其他条件留空，或者不选择任何条件，将所有条件留空。
Sometimes the user may want to sort the data only on one of the available selection criteria and leave the others blank or select no criteria to sort the data by leaving all the criteria blank.
他们发现，如果人们有条件在家工作，压缩工作时间，那么他们就可以选择更为健康的生活方式，锻炼身体的机会增多。睡眠也会更好。
They found that if people have the ability to work from home and to compress work weeks, they are more likely to make healthier lifestyle choices, to exercise more and to sleep better.
图6.42。选择函数，用于有条件地选择两个可能的输出。
Figure 6.42. The Select function used to conditionally switch between two possible outputs.
如有条件的话，到过外去“镀金”是不做的选择。
Be like conditional word, outside arriving, go "aureate" it is the choice that does not make.
反胶团液-液萃取技术具有条件温和、高选择性、易放大等优点，是一种应用前景极好的生化分离方法。
Liquid-liquid extraction using reversed micelles is a promising biochemical separation approach, which can be easily scaled up, operated in moderate conditions and possesses high selectivity.
不能否认，很多没有上过大学的人也取得了事业上的成功，但是，如果问问他们，他们会说：如果当时有条件，他们也会选择上大学的，因为上大学与成功是不矛盾的。
But if you ask them, they will say that if they had had the chance, they would also have chosen to go to college, for college education never contradicts success.
不能否认，很多没有上过大学的人也取得了事业上的成功，但是，如果问问他们，他们会说：如果当时有条件，他们也会选择上大学的，因为上大学与成功是不矛盾的。
But if you ask them, they will say that if they had had the chance, they would also have chosen to go to college, for college education never contradicts success.
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