重點講解：
1. focus on 集中（注意力）；關注；
例句：Throughout the exercise, focus on keeping your abs tight.
整個鍛煉過程中，注意要緊繃腹肌KauMEC_Hex~q%h]5T。
2. participate in 參與；參加；
例句：They expected him to participate in the ceremony.
他們希望他參加典禮a7]dlNoR,r6rr8O.wVqb。
3. complain about 抱怨；發牢騷；
例句：The neighbours always complain about the noise.
鄰居們總是抱怨噪音問題rCk8qdj_RH_nB。
4. learn from 向……學習；
例句：There is a great deal to learn from Hal's expert approach.
從哈爾熟練的方法中可以學到很多EfuwcfcM6NOBK.4UMjg。
5. no doubt 無疑地；必定；
例句：She's a very sweet woman, as you no doubt know by now.
她是一個非常溫柔的女人，你現在肯定知道了)NklF&GD^-C^。