定语从句
有些地区过去强调学业成绩不是学生全面发展，这是值得反思的社会现象。
(which)
In some areas/ regions, too much emphasis has been put on academic achievenment instead of the students overall development, which is the phenomenon worth of reflecting on.
随着科技的发展，火星不再是人类不可进入之地，这将得到进一步的证实。
(inaccessible)
With the development of science and technology, Mars is no longer inaccessible to man, which will further prove (to be) true.
相比较而言，海上旅行能提供各种舒适的条件，以我愚见，这会给你带来难忘的体验。
(humble)
Conwaratively speaking
,traveling by sea
offers/ can offe ...