You may need to alter your walk breakfrequency to adjust for breaks in your training, course conditions, and weather conditions.
在训练过程中,你也许需要多次调整步行安排,随着路程、天气的变化而变。
2
Scientists are mostly stumped as to how the radio frequency waves emitted by cellphones, which lack the punch to break chemical bonds or disrupt DNA, might cause cancer.
Poseida had been the least damaged of the major Atlantean cities after the break up into islands, and was still of a very high frequency and quality of life.