1.When a day is over feel strain and the muscle ache, because of that indicates that I have work with all one's might job capability.
一天结束时感到疲劳和肌肉酸痛，因为那表示我有拼命工作的能力。
2.I have pain inside my eyes, and feel strain in seeing and tear easily.
我眼底里觉得痛，看东西的时候觉得疲累，而且流泪。
3.If you feel strain in your lower back, rest for a moment, then resume the exercise.
如果你感到下半身太紧，休息一下，接着把这也运动做完。