Placement

What Is a Placement?

A placement is the sale of securities to a small number of private investors that is exempt from registration with the Securities and Exchange Commission under Regulation D, as are fixed annuities. This exemption makes a placement a less expensive way for a company to raise capital compared with a public offering. A formal prospectus is not necessary for a private placement, and the participants in a private placement are usually large, sophisticated investors such as investment banks, investment funds, and insurance companies.

中文叫定向增发？

source: https://www.investopedia.com/terms/p/placement.asp

 

debounce-vs-throttle

https://redd.one/blog/debounce-vs-throttle

用动画的形式给出了差别的描述。

文字上来说， debounce 

Discard emitted values that take less than the specified time, based on selector function, between output.

而  throttle

Emit value on the leading edge of an interval, but suppress new values until durationSelector has completed.

所以对某个时间段参数， 用throttle会保证一次发生（不会多）， 而debounce不能保证发生。