The problem is that catalysts and membranes have been expensive until recently.请问这里catalysts and membranes是最近才开始变贵,还是从以前到最近一直都是这么贵,还是说以前一直贵,但最近不贵了?还请教 until recently 是否有多种不同的用法?
...个句子:One day when entering your home, your mother says your family is having dinner with the family of one of her old friends. “when”是引导的定语从句修饰“day”?还是one day是后面这个状语从句里的,为了强调提前了?谢谢老师。
the whole point of defining this familiar process as transmission memes is so that we can explore its analogy with the transmission of genes.请问老师这里的be so that用法是什么?
If the Administration won’t take the legislative initiative, Congress should help to begin fashioning conservation measures.这里是指在法律上采取主动权,还是指采取法律方案?If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally...
Today it is common for corporations to direct their attention to
serving shareholder and management interests and to achieving the highest or
short-term financial return.请问老师,这个句子中,shareholder 不是可数名词吗,可以不用加复数的吗?