effort on，例如：
1.She spends too much effort on things that don't matter.她在一些无关紧要的事情上花费精力太多。
2.The effort spent on careful grading, mixing and compaction of concrete will be largely wasted if the concrete is badly cured.如果混凝土养护得很差，那么在精心选定混凝土的级配、拌和和密实成型上所耗费的精力将是徒劳无益的。
3.We need to make a concerted effort to finish on time.我们需要通力合作才能按时完成。
