词典例句:The pipes should be made of plastic.翻译为这些管子应该是塑料制作的。
那么should是推测用法?但是我看词典提到should表示推测用法的是表示预期的应该会,可能含义,如:We should arrive before dark.// I should have finished the book by Friday.
此外并没有看到类似The pipes should be made of plastic.这样的推测用法,还请老师指点!