托福写作核心词组一览
对于托福写作的同学们来说，不知道对于自己的写作能力有没有自信呢?今天就和出国留学网来看看托福写作核心词组一览。1.a couple of 两三个，几个Although he thought of the key idea in 1951, the first maser was not completed until acouple of years later.2. account for 解释Variations of clay composition and the temperatu...