老师想请问一下，单词表中是National Science Museum，但是在课文中就加了the，变成the National Science Museum，还有Hangzhou National Tea Museum为啥在单词表中不加the，然后放在课文中又加了the，又变成the Hangzhou National Tea Museum呢？
中：中小微企业和个体工商户困难较多，稳就业压力较大。英：Our MSMEs and
self-employed individuals are still finding the going tough, and the pressure
in maintaining stable employment is mounting.The going tough 在这里是the+形容词表示抽象概念的用法吗？
And if a book starts to drag, giving up on it to stream a movie over Netflix or scroll through your Twitter feed is only a few taps away. 本句话句子结构不理解，求老师给以划分和翻译，谢谢谢谢了!
... and animals have suffered from climate change, and we are trying our best to... 另外请教 We have to preserve what we believe is valuable这句的句法结构，这句中省略了那些成分,谢谢！
Its hero avoids being civilized—going to school and learning to read—so he can preserve his innate goodness.参考译文：书中的主人公拒绝被教化—不上学，不学习读书写字——这样他就能保持自己的善良。此处的破折号什么意思呢？为什么会翻译成...
Hugging with these gentle giants-cows typically weigh about 1500 to
2000 pounds has an extremely soothing effect.Hugging with these gentle giants-cows (that) typically weigh about 1500
to 2000 pounds has an extremely soothing effect.为什么可以省略？什么情况下可以省略？
Many animals have disappeared during the long history of the earth. The most famous of these animals are dinosaurs. They lived on the earth tens of millions of years ago, long before humans came into being and their future seemed secure at that time.请问：句中的 The most famous of these animal...
...语吗。老师，几个问题能列出例子吗？jumping down from the chairis yesterday was known by her mother.动名词非延续性动不一定表进行吗？It is true to have broken(非延续性动词) his leg just now（具体的时间状语） .不定式的完成式...
Some of the mourners saw in the dust visions from that deadly day when the very ground was on fire and the powder and smoke caked the living and the dead. 参考译文：有些哀悼者在尘土中看到了那个致命的日子的景象：大火就在这这块土地上燃烧，灰尘和烟雾...