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641. on the sly 偷偷地 642. smell of 有的气味 643. be sorry about/for 懊悔的,后悔的,难过的 644. speak ill of 说的坏话; speak well of 说的好话 645. specialize in 专门研究, 专攻 646. in spite of 尽管 647. on the pot在现场, 在出事地点; 或 立即 648. take a stand against 采取某种立场反对 take a stand for 采取某种立场支持 649. stare at 目不转睛地看, 凝视, 盯着 650. in step 步伐一致; out of step 步伐不齐 651. stick sth. on 把贴在上 652. stick to 粘着, 坚持 653. stick at 继续勤奋地致力于stick ones work坚持工作; stick at ones books 勤奋读书 654. stick to 坚持; stick to ones promise 比喻食言 stick to ones friend 忠于朋友 655. in stock 有.货 656. be strict with 对严格要求 657. be/go on strike 罢工 658. subjectto使受..到 subject to 易受到的 659. submitto 提交 660. substitutefor 以代替 | 
