if only 要是…多好;要是,只要
improve on 改进
on (the) impulse (of…)凭(…的)冲动
for instance 例如,举例说
instead of 代替,而不是;不是…(而是)
at intervals 不时,时时
at intervals 不时,时时
by itself 独自,单独
in itself 本身<br>
K
keep back 阻止,阻挡;隐瞒,保留
keep down 控制,压制,镇压;压低,放低(声音)
keep from 使…不(做)(=prevent from)
keep off 不接近,避开
keep on 继续不断,保持
keep out of 躲开,置身…之外
keep to 坚持,保持
keep up 保持,维持;继续进行,坚持
keep up with 向…看齐,跟上…
knock down 撞倒,击倒
knock out 击倒,击昏
known as 被认为是,被称为