When it comes to the letter grade on your test or homework, you might notice that there is no letter. Have you ever thought about why that is so?
当涉及到你的考试或家庭作业的字母分数时，你可能会注意到没有字母。你想过为什么会这样吗？
2
The museum said that every possible test has been done on the painting and insisted that "no inscriptions, letter or numbers, were discovered during these tests.
博物院称已经对《蒙娜丽莎》进行了一切可能的测验，并称“在测验中没发现任何题字、书信和数字。”
3
Smith & Nephew slid 1.6 percent to 675 pence after the company got a warning letter from the FDA saying it failed to properly test medical devices.