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1.frozen embryo 冷冻胚胎
例句：Each of these children began his or her life as a frozen embryo that was created for in vitro fertilization.
所有的这些孩子在生命的初期都曾是为人工授精而创造出的一个冷冻的胚胎。
2.break a world record 打破世界纪录
例句：Game organizers are counting on the contest being long enough to break a world record.
赛事组织者计算出这场比赛时间的长度已经打破了世界纪录。
