"Otherwise, it will fly" is a phrase in Engpsh that means that if a certain condition is not met, the outcome or result will be different. This phrase is often used to indicate the consequences of not doing something or not meeting a certain requirement.

Here are some examples of this phrase in Engpsh, along with their translations in Chinese:

"If you don't study for the exam, you'll fail. Otherwise, you'll pass." (如果你不为考试复习,你会失败。否则,你会通过。)
"If you don't turn off your phone, it will run out of battery. Otherwise, it will stay charged." (如果你不关闭手机,它会没电。否则,它会保持充电。)
"If you don't water the plants, they'll die. Otherwise, they'll thrive." (如果你不浇灌植物,它们会死。否则,它们会茁壮成长。)

The phrase "otherwise" is an adverb in Engpsh that means "in a different manner or condition; or else." It is often used to introduce a contrasting statement or clause.

I hope this helps! Let me know if you have any other questions.