重点讲解：
1. suffer from (因疾病或处于其他不利境地而)受苦，受难，受折磨；
Many theories have been advanced as to why some women suffer from depression.
就一些女性患抑郁症的原因，各种说法纷至沓来;Qn^|xG-Lm4r。
2. from time to time 不时地；间或；偶尔；
Her daughters visited him from time to time when he was ill.
他生病的时候她的女儿们时常去探望他6h#JvrMULuiKsZEz。
3. rely on 依赖；依靠；
The investigation will rely on existing powers to subpoena documents.
该调查将凭借现有权力要求将各种相关文件呈堂LFX)7;3fHdM|r-,。
4. figure out 想出；理解；弄清；
I can't figure out how to do this.
我弄不懂怎样做这件事]v@1Ai4t&Sl9B%Z。