623. sensitive to 对…敏感; sensible (of)觉察到的; sensational耸人听闻的

　　624. in sequence 按顺序, 按先后次序

　　625. share in (=have a share in) 分摊, 分担

　　626. share sth. with 与…分享,分担,分摊,共用

　　627. be shocked at / by 对…感到震惊

　　628. fall short of 达不到

　　629. go short of (=be without enough of) 缺乏

　　630. for short (in a short form) 为简便,简称

　　631. in short (=in a few words, in brief)简称

　　632. in short supply 供应不足

　　633. be short of (=lacking enough)缺乏,不够

　　634. be shy of 难为情, 不好意思

　　635. at the side of 与…相比

　　636. take the side of 站在…一边

　　637. catch the sight of (=see for a moment)瞥见

　　638. at the sight of 一看见…

　　639. (be)in sight (=in view, visible) 看得见

　　out of sight 看不见

　　640. know sb. by sight 与…只面熟

　　641. on the sly (=secretly) 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 (=despite) 尽管

　　647. on the pot(=at the place of the action)在现场, 在出事地点; 或(=at once) 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