What do these words or phrases mean in this sentence? One of the main charges leveled against The Great Gatsby is that it is populated with fake, hollow characters. While this assertion carries some truth, it misses much of what Fitzgerald set out to do in the novel, and the literary aesthetic necessary to pull it off. The 1920's flappers were themselves playing a part that did not allow for much depth. Even the main character, Jay Gatsby, [[[[ at ]]]] his seeming most [[[[ confessional ]]]] inhabits a role he has artfully crafted. Perforce, Fitzgerald created many characters who were not [[[[ wrestling with existential doubts ]]]] but who served as a backdrop for a time and a place. What does "confessional" mean in this sentence? and I'm also confused about the grammar of "at his seeming most confessional ", especially the "at". what's the meaning of "wrestling with existential doubts" in the context?

Can you explain the meaning of the sentence in easy English? "the scope of the entire work is deceptive; the 120-page translation of the well-known classic makes for a brisk jaunt, yet it is, in a sense, largely preludial to the magisterial commentary, which accounts for well over 80% of the text found in the work."

Marsh is a see also of swamp.—— Is this sentence correct? I saw this sentence in WikiDiff. Is this sentence correct? If it is, what is the meaning of "see" in this sentence?

Topic: technology products The update of technology products is increasingly frequent, which on one the hand benefits modern citizens by renewing their working and living tools and providing more convenience, on the other hand, adds to people's financial burden as they are persuaded into purchasing new versions of a product. When it comes to the consideration that if it is better to buy the product immediately after it comes into the market or waiting for a while before taking actions, from my point of view, the latter one is more advisable. First of all, paying attention to reports of user experience of the new technology product while waiting for a while after its release, we can evaluate the product more carefully and thus stand a better chance to save the money for a product with more stable performance and useful functions. Every time I want to change a technology product, such as a mobile phone or a computer, instead of selecting from the latest products, I prefer to make comparison among several products, which is just behind the frontier, from different companies. I can always find much information and comments about them on the internet, which greatly assists me to make decisions. On the contrary, buying the latest products often worries me because I can learn little about it and risk wasting money. In addition, we can make a better deal buying the most cost-effective product after its price goes down since the price of technology products usually drops drastically when comparable products of other companies come out or new versions of the product are released. Latest products are usually more expensive than they actually deserve, not only because they represent the latest technology or the fanciest designs, but also because it is a good opportunity for companies to take advantage of people's nature of curiosity and desire to stand out to make more profits. My father is interested in photography. When he thought twice over which camera to buy, he valued more on its economic efficiency and made the best deal. As far as I'm concerned, he is a good example for us to follow.

How to say these words in English?

Are there two different words in English to differentiate these two concepts?

1. Being happy (快乐)

2. Being happy from the bottom of one's heart and for a relatively long period of time. （幸福）

Are there different words to describe "being happy"? If any, what are the small differences among them?