Over half of Mexican 15-year olds were classed as incapable of doing basic arithmetic on the maths portion of the test.

在墨西哥15多岁的少年中，超过1/2的人员在测试中的数学部分被划分为不会做基 础算术。

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A portion of the buffer cycle in which the logic or arithmetic unit must cease operation or neither will be able to communicate with the memory unit.

缓冲存储器周期的一部分，在这期间，逻辑与算术运算器必须中止操作或不能与存储器传输信息。

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