"The car industry is very important in Japan."
This is simply saying that the car industry is an important part of Japan's economic industry.
"The car industry is a symbol of Japan."
A symbol is something that represents another thing in imagery. The Toyota symbol represents Toyota.
"The car industry is very important in Japan."
［訳］車産業は日本ではとても重要です
これは単純に、日本経済にとって車産業は重要だと言っています。
"The car industry is a symbol of Japan."
［訳］車産業は日本の象徴です
"symbol"とは、象徴という意味です。"the Toyota symbol"（トヨタのマーク）はトヨタの象徴です。
The phrase "world renowned" means that whatever it is talking about is well know all around the world. This is a common phrase in American English. I hope that this helps. :)
Most people may think of Japan when it comes to the Automotive industry.
The automotive industry is an important aspect of Japanese commerce.
1.
To imply that most people think of something when given a specific topic of thought reflects that that thing is well known due to popular belief. It indicates that someone or someplace is well known for that particular concept or thing.
2.
An "important aspect" is a valuable part of what makes up someone or something, and its contribution or existence is significant. Commerce is a term that can be used to refer to general business or trading.
1.
"Most people may think of ___ when it comes to ..."（...と言うと、ほとんどの人は___が頭に浮かぶでしょう）は、世間一般によく知られていることについて言います。「___は...でよく知られている」という意味合いです。
2.
"important aspect" は、「重要な部分」「貢献度の高い部分」を指します。"commerce" は商業やビジネス全般を指します。
Japan has a strong association with the car industry.
One of the most important exports for Japan is the production of cars.
Japan has strong ties with the car industry.
Japan has some of the most recognisable car manufacturers in the world. When you ask people if they know what cars are produced in Japan, generally speaking, most people can name at least one - Toyota!
When choosing the correct words to link Japan and the car industry you can consider words such as: association; strong ties; links. These all suggest a joining between Japan and the car industry. You can also be more specific and discuss the relationship Japan has with the car industry or how one of Japan's greatest exports is the production of cars.
Japan is well known for it's car production industry
The car industry is a representative industry in Japan
The car industry is the leading industry in Japan
If something is at the top of it's work and better than something else it is said to be 'leading'
'well known' means alot of people know about it, representative means to show off it's good points and make a good example so the car industry in Japan is at the top and respresets the top insudtry in Japan
イギリス 
アメリカ合衆国 
カナダ 
オーストラリア 
