초록보카책에 있는 예문중 하나인데요,
A variant of tubercle bacillus has been discovered that is more likely to infect Americans.
여기서 that은 관계대명사이고 선행사가 A variant of tubercle bacillus 인것이죠?
또하나, 다음문장 해석좀 해주세요.
No one is so old but he may learn = No one is so old that he may not learn