51.in no case 在任何情况下都不(放句首倒装句) $ b% A4 `7 t6 x% q52.be cautious of 谨防- B. `" |0 X- \
53.center one‘s attention on (=focus one’s attention on) 把某人的注意力集中在……上. F2 I. |+ k( q! @/ L% }
54.be certain of (=be sure of) 有把握,一定。 8 h H0 _" ?6 G6 ^ 55.for certain of (=for sure) 肯定地,有把握地: G- |/ A9 X; U* E' z, ?0 L
56.attach(to) (=to fix, fasten; join) 缚,系,结1 R, D: k& \8 g
57. make an attempt at doing sth. (to do sth.)试图做……) o1 @$ S Q/ E: a: a
58.attend to (=give one‘s attention, care and thought) 注意,照顾;attend on (upon) (=wait upon, serve, look after) 侍候,照料, x6 u# H- G+ I0 a
59.attribute to/ toward ……对……的态度、看法9 V- E9 A: C' N$ c3 C
60.attribute……to…… (=to believe sth. to be the result of……) 把……归因于……,认为……是……的结果