This is just the top row of keys on an English-language keyboard. 这只是英文键盘上的第一排字母键。
In the second test, students were presented with a row of three letters and asked to ignore eerything except for the letter in the middle. 在第二个测试中,给学生们出示了一行三个字母并要求他们不要想别的仅仅去想中间的字母。