語句
形容事物突然出現，尤其出現時有好大影響或者引人注目 something appear all of a sudden, with great impact or being noticeable
Definitions (Wiktionary)
phrase, idiomatic
to appear suddenly; to appear out of the ordinary; to be spectacular
Examples (Wiktionary)
Mandarin
从前我可以不怪您，那您现在私生的孙子横空出世，还被您大肆宣扬，究竟又是怎么一回事？！
從前我可以不怪您，那您現在私生的孫子橫空出世，還被您大肆宣揚，究竟又是怎麼一回事？！
cóng qián wǒ kě yǐ bù guài nín ， nà nín xiàn zài sī shēng de sūn zi héng kōng chū shì ， hái bèi nín dà sì xuān yáng ， jiū jìng yòu shì zěn me yī huí shì ？ ！
I can forgive you for the things in the past, but now your illegitimate grandson was born, and you are making this news well-known - what is going on?!