每个组进行三项测试——前测、后测以及两项测试后紧接一周的测试。
Each group was given three tests - a pretest, a posttest, and a test a week after the first two tests.
在测试进行的前一个月，他们发现在某些日子里，他们每天可以发送高达7000条短信。这推动了他们在紧接下来的一个月里打破记录的企图。
On a test run the prior month, they found that they could send up to 7,000 texts on some days, which prompted their record-breaking attempt the following month.
在上面的例子中，锁的实例会被请求四次：前三次是执行append方法，最后一次是执行toString方法，紧接着前一个。
In this case an instance lock is acquired four times: three times for the append method and one time for the toString method, right after another.
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