英语翻译：这是什么意思啊shelf take-down

与shelf taken-down（自动下架） 对应的是shelf registrations（自动上架）,
网上我找到一部分文章可供参考：
Issuers that are eligible to use Form S-3 often use shelf registrations and shelf take-downs to expedite the process of raising capital in the public market,
Although the shelf process mitigates some of these expenses and timing issues,even a shelf take-down can result in surprisingly high transaction costs and take an unacceptable amount of time for an issuer that needs to take advantage of a narrow market window.Moreover,because of the length of this process,the time between the announcement of the sale and its completion leaves the market price of the issuer’s existing securities susceptible to speculation,fluctuation and downward pressure in anticipation of the upcoming sale of additional securities.