Have Opportunity in Chinese / Japanese...

機 is an odd one - I've seen this on coffee cups and posters with the meaning of “opportunity.”

機 is a correct definition but this character also means “machine.” In fact, if you put the character for “flying” in front of this character, you have the Chinese word for “airplane” (literally: flying machine). Alone, on a wall scroll, it will be generally understood as “opportunity” but I want you to know this extra information before you make your selection. Note that in Japanese and Korean, this has a similar meaning but can also mean machine or loom.

See Also:  Success

危機 means crisis in Chinese and Japanese.

Separately, the first character here does mean “danger” or “to endanger,” and the second character can mean “opportunity.”

However, I want to debunk a myth that was propagated by some westerners who did not have a clear understanding of Asian languages...

While often, Chinese/Japanese/Korean compound words (words of two or more characters) are the sum of their parts, this is not always the case. The compound is often understood with a completely different meaning than the two characters individually.

Many have said that the Chinese/Japanese/Korean word for Crisis is made up of the characters for “danger” and “opportunity.” 危機 is true when phrased this way.
However, it's not absolutely correct to say that “danger + opportunity = crisis” in Asian cultures.

English example:
If I tell you that...
Bovine creature + Guy behind the plate in baseball = Locomotive train protection
...you would think I was mad. But consider that “cow + catcher = cowcatcher,” which is the device that used to be found on steam engines to protect them if they hit an animal on the tracks. When we hear the word “cowcatcher,” we don't separate the words into their individual meanings (necessarily).
The same is true with the word for crisis in Chinese/Japanese/Korean. While you can separate the characters, few Asian people would automatically do so in their minds.

The final answer:
It is a half-truth to say, “danger plus opportunity equals crisis” in Chinese/Japanese/Korean. Use this statement and concept with caution.

Also, the second character can mean “secret” or “machine,” depending on context so I guess you have to say “a dangerous machine = crisis” or “danger + a secret = crisis.” Both of these are only slightly more ridiculous than the first premise.

PS: 危機 is probably not a great word for a scroll unless you have a special use for it.

This Japanese title can be translated as “for this time only,” “chance meeting,” “one meeting, one opportunity,” “never again,” or “one chance in a lifetime.”

The characters literally mean “one time one meeting” - of course, the Kanji characters have meaning far beyond a direct translation like this.

Some might use this proverb to talk of an opportunity that presents itself just once in your life. It could also be a one-and-only chance meeting with your true soul mate. An expression of any event that might happen once in a lifetime.

This is primarily a Japanese title, however, there is also a Traditional Chinese (and old Korean) version of this proverb. Just the last character is different.
The traditional form was used in Japan before WWII and in Korea prior to 1900. This title is somewhat known in China.

If you want the older traditional form, just click on the character to the right.

自行束脩以上吾未尝无诲焉 means, for anyone who brings even the smallest token of appreciation, I have yet to refuse instruction.

Another way to put it is: If a student (or potential student) shows just an ounce of interest, desire, or appreciation for the opportunity to learn, a teacher should offer a pound of knowledge.

This quote is from the Analects of Confucius.

This was written over 2500 years ago. The composition is in ancient Chinese grammar and phrasing. A modern Chinese person would need a background in Chinese literature to understand this without the aid of a reference.