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1.blue whale蓝鲸
But past studies suggest only blue whale males make calls like this.
但是在过去的研究表明，只有雄性蓝鲸才会这样唱歌。
2.require for 需要
There may be scenarios where most of the data you require for reporting exists in one database with the exception of a few other key tables.
有可能存在这样的场景：您的报告需要的大部分数据都存在于一个数据库，但几个关键表除外。
3.hold back 抑制；阻止
Stagnation in home sales is holding back economic recovery.
住房销售的停滞正阻碍着经济的复苏。
