Numerous researchers now agree that 10,000 hours of such practice as the minimum necessary to achieve expertise in any complex domain.
许多研究员现在都同意，10000小时这样的熟练练习的是在任何复数域获得专门技能的最低的要求。
After a long time of retrieval practice, CALIS union catalog database generally has 21 kinds of duplicate data types.
经过长期的检索实践发现，CALIS书目数据库大致有21种重复数据类型。
However, in practice, may variant usages about "we" are used. Often going beyond the grammar category the plural forms of the first personal pronoun, "we" has some special rhetoric meanings.
然而在实际应用中，它又存在着许多变异用法，常常超越第一人称复数这一语法范畴，具有特定的修辞意义。
练习单词的单复数形式。
练习单词的单复数形式。
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