说明 isn't followed by an object.
For example, 说明人是多么不容易自知 = it explains how people rarely know themselves (you don't need to state whom you are explaining to)
告诉 needs to be followed by an object.
For example, 告诉人們， 人是多么不容易自知 = it tells people that people rarely know themselves (you need to state whom you are telling to)
Since there's no object in the ...
In here, 尤其多 = 特別多.
刺细胞 is a peculiar weapon of 腔肠动物 to attack and defense, (it concentrates in the head), the count is especially high at the 触手处.
尤其 - Often used in the occasions to point out something with superior quality than, and stands out above, others in comparison. For example:
事 - thing, matter, work, that one does.
業 - occupation, business, trade, that will bring in and accumulate wealth.
事業 - an accomplishment/establishment of a person, through his work or business, that is measurable by his accumulated wealth. In the past, the craftsperson's line of work was not considered to have the potential to achieve that in his lifetime, ...
The author expects the reader is familiar with Chinese culture.
Expect in this context refers to 預期 (expect; assume)
Google Translate: 作者預期他的读者是熟悉中国文化的。 --> the author expects his readers to be familiar with Chinese culture
The author's assumption was based on logical deduction. Only people familiar with Chinese culture would be interested in reading ...
而自知之明之所以“贵”，则 [说明] 人是多么不容易自知。
Have a clear understanding of self is deemed a precious personal trait, the sentence "explains" that it is not easy for people to know themself.
In here, 贵 meant 珍贵, which in turn means rare or scarce. The first phrase in the complete sentence was an ancient teaching written in the old language (古文), and the second ...
We can understand it as:
Since 刺细胞是腔肠动物特有的攻击和防御的利器, therefore 在触手处尤其多.
尤其 in this context can be replaced with 特别, which denotes the sense of "rather unusual".
The sentence implies, more or less, that other parts might not have so many. But that's not the point the author wants to ...
外胚层有多种细胞，如刺细胞 (There are many kinds of cells in the ectoderm, such as stinging cells)
It already mentioned 刺细胞 is one kind of cell on the outer layer
And it is particularly numerous on the tentacles
Seems straightforward enough -- numerous stinging cells covered the entire creature, especially on the tentacles
dedicated: wholly committed to something, as to an ideal, political cause, or personal goal, from Dictionary.com, 2016 snapshot - 尽心尽力的，尽职尽责的
事業心 could mean dedicated, but in this context it is likely to be misinterpreted as 'enterprise', which emphasises on self, e.g. the money one gains, while 'dedicated' on the art, the technique and how loyal one is ...
Appreciate the question and all the answers provided, I came across this post in search of the English term for 「歿」 for my work.
The usage will be a little different depends on which part of Chinese world you are at. I grew up in Kaohsiung, working, traveling and living in mainland China.
To add onto the The common polite terms for 「死了」(died)…
by my ow ...