请教各位老师:【句子】Relaxation and recreation, which are considered to
be an indispensable element of life. 这里的主语不是relaxation和recreation两个吗，为什么要在element之前用an修饰？
...ursory exposure is enough. They must hear a language quite a bit to understand it—and use it often to be able to speak it comfortably.我请老师分析粗体部分句子结构，use it often to be able to speak it comfortably，我晕。
请问老师while在这里是什么用法？Its Intelligent Transport System tells drivers when roads are crowded,
while changing traffic lights and planning alternative routes that drivers can
follow.
Also explored were the photophysical properties and conduction characteristics
governing the devices fabricated using these nanomaterials.我把explored 这个当成形容词在句子中作主语，不知道理解的对不对?
1. Poetry is a breautiful way to express ____(think) and feelings. 可以填 thinkings 吗？ 2. There is a beautiful ____(paint) on the wall in each room of my house. 可以填 paint 吗？
...现一个改错不会，麻烦您了!The woman was still being questioned, and it remained unclear how much information she had in the group's operations. 老师给的答案是去掉being，但是我觉得being没什么错呀，关于这个被动要不要加being的有点乱。
American opinion was really as galvanized by the torpedoing of the Lusitania as by Pearl Harbour and September 11th 2001. 这里第一个as后面为什么是被动语态的？不是应该接形容词或者副词吗？
Russians have a deep love for their own language and carry large chunks of memorized poetry in their heads, while Italian politicians tend to elaborate speech that would seem old-fashioned to most English speakers.这句话的 memorized如何理解？
..., followed by reopening factories April 14 in Kentucky, Michigan, Missouri and Ohio.
福特之前计划四月六号在墨西哥重新开始生产，随后计划四月十四日在肯塔基，密西根，密苏里和俄亥俄重新启动工厂。
翻译的对么？
所以by后面某个位置是不...