fly-by-night的音標為["fla?-ba?-na?t] ，意思是不可靠的或不穩定的。

速記技巧：可以嘗試使用縮寫形式，如f-by-n，這樣更易于記憶。同時，也可以將單詞拆分記憶，f和night各自記憶。fly可以聯想為飛翔，night可以理解為夜晚，組合起來就是“在夜晚飛翔”的意思。

請注意，這只是一種記憶技巧，實際記憶效果可能因個人差異而異。

Fly-by-night這個詞源于英語，它的意思是“不可靠的，不可信賴的”，源自于飛行和夜晚兩個詞。這個詞最初是指那些在夜晚飛行，但無法保持穩定和可靠的飛行器，后來逐漸引申為“不可靠的人或事物”。

變化形式：名詞fly-by-night騙子，形容詞fly-by-nighting不可靠的。

相關單詞：

1. Reliable - 可靠的

2. Untrustworthy - 不值得信賴的

3. Stable - 穩定的

4. Unstable - 不穩定的

5. Credible - 可信的

6. Incredible - 不可信的

7. Shadow - 影子，暗影

8. Nightmare - 噩夢

9. Illusion - 幻覺

10. Phantom - 幻影，幽靈

常用短語：

1. fly by night job

2. fly by night operation

3. fly by night person

4. fly by night scheme

5. fly by night investment

6. fly by night company

7. fly by night money

例句：

1. He is a fly by night operator who always changes his business.

2. She is always looking for a fly by night investment opportunity.

3. The company is suspected of being a fly by night company, and its employees are suspected of fraud.

4. The government should crack down on fly by night money lenders to protect the interests of the public.

5. We should be careful of investing in fly by night schemes, because they may be risky.

6. The police are investigating a suspected fly by night operation in the city.

7. She is a fly by night artist who always changes her style and medium.

英文小作文：

Title: The Mystery of the Fly-by-Night Company

One day, I received a mysterious email from a company that claimed to be a new startup but had no website or physical address. I was skeptical at first, but I decided to give them a chance because they seemed to have some good ideas and a good team. However, after a few weeks, I found out that they were not really a company at all, but just a group of fly-by-night operators who were trying to scam people out of their money. I was disappointed and angry, but I also realized that we need to be more careful when dealing with new businesses and avoid investing in fly-by-night operations that may not be legitimate.