信用证条款,帮忙翻译,分析.感谢!

信用证条款,帮忙翻译,分析.感谢!
usance period 120 days to be counted from the date of negotiation . additional amount if any for the usance period are on applicant's A/C not exceeding libor ,and would be paid on maturity upon receipt of separate claim memo/draft along with original documents claim memo/draft for additional amount for the usance period if sent by separate mail will not be acceptable.