近几个月来，美联储在开展“逆回购”的试验，但次数不多。
The Fed has been conducting limited tests of “reverse repos” in recent months.
科研开展方面。教师实际参加学术会议次数不多，大部分教师年均参加不足1次。
Teachers seldom attend academic conferences, and most teachers participate in the annual conferences, less than once a year. (9)Research production.
五十年代晚期以及六十年代猫王登台演唱的次数不多，他大部分时间都在拍摄电影、创作电影原声。
He staged only a limited number of concerts during the late 1950s and 60s and spent the majority of his time making films and writing movie soundtracks.
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