481. slip one's mind 忘记
482. so far 迄今为止
483. somewhere around 大约
484. sooner or later 迟早,早晚
485. sore throat / foot嗓子哑/腿酸
486. stay up late 熬夜
487. step by step 逐步地
488. subject to受制于,易于
489. such as 例如,诸如
490. sufficient for足够的
491. suitable for/to适合于
492. superior to优于,级别高于
493. sure of /about对...有信心,确信
494. suspicious of怀疑
495. take a leave请假
496. take a seat / be seated
497. take one's place 取代
498. take one's time慢慢来
499. takesth. seriously 认真对待
500. take up占据
501. thanks to 由于,多亏
502. that is (to say) 就是说,即
503. the reverse is also true 反之亦然
504. tired of对...不在感兴趣
505. to the point 切中要害,切题
506. turn over 倾覆
507. typical of是典型的,特有的
508. uncertain of /about不确知
509. under control 处于控制之下
510. under the circumstances 这种情况下
511. up in the air没有确定
512. up to date 在进行中
513. up to 多达;直到;胜任;取决于
514. vital to对...关系重大
515. void of adj. 没有的，缺乏的；没有…的
516. what about 怎么样
517. what if 切合目前情况的/如果...那又会怎么样？
518. what's up / new?发生了什么事?
519. with regard to 关于,至于
520. with respect to 关于/至于/如果/相对于
with respect to sth. 涉及涉及
521. with the exception of 除...之外
522. without any trace没有踪迹
523. without fail 一向如此
524. without question 毫无疑问
525. wolf down狼吞虎咽
526. word for word 逐字的