withdraw (floatamount)：从帐户中提取指定量的金额。
Withdraw (float amount) : Withdraws a specified amount of money from the account.
提取速度快，成功率达到90%，为后续DNA精确定量分析打下了坚实基础。
The success ration is 90%. It provides a foundation for exact quantitative analysis of DNA.
提取速度快，成功率达到90%，为后续DNA精确定量分析打下了坚实基础。
The success ration is 90%. It provides a foundation for exact quantitative analysis of DNA.
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