1. The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them. 间接相互作用导致的已知物种灭绝或破坏的情况的稀少，反映的或许不是这种灾难的罕见，而是没有去寻找或检测它们。
2. In spite of infrequency, complications secondary to placement of these surgical drains occur. 尽管不常见，但因放置外科引流管导致的合并症仍会发生。
3. With their greater infrequency the sounds increased in strength and sharpness. They hurt his ear like the trust of a knife; 随着频次变少，声音变得越来越大，越来越尖锐，像刀子一样刺痛他的耳朵；
4. Doctors can get an inkling by questioning people about their age, diet, infrequency of exercise and smoking habits—but it is only an inkling, not a direct measurement. 医生可以通过询问病人的年龄、饮食、锻炼的频率以及吸烟的习惯得到初步印象——但这仅仅是初步印象，并不是直接测量。
5. Doctors can get inkling by questioning people about their age , diet , infrequency of exercise and smoking habits —but it is only inkling , not a direct measurement . 医生可以通过询问病人的年龄、饮食、锻炼的频率以及吸烟的习惯得到初步印象——但这仅仅是初步印象，并不是直接测量。
