He suffered a lot of discomfort.He had been suffering from repeated stomach ache.请问, "遭受不适"和"遭受胃痛"感觉上是同一类的, 为什么一个句子用suffer ,另一个却需要用suffer from? 这 from repeated stomach ache 又是什么成分?
We need principals from all stakeholder groups in Davos to summon the imagination and commitment necessary to tackle the problem.请问 necessary to tackle the problem 作什么成分?