为什么要分层入模

杭州DDD邮电公司Hangzhou DDD Co.Ltd.，是一家自营进出口公司，与法国EEECo.Ltd.签订了如下的进口合同，请翻译相关的条款，并回答相关问题：
EEE CO.LTD.
1AVENUE DU GENERAL LECLERC BP 60
93122 LA COURENEUVE CEDEX TEL：0033-1-483788888
FRANCEFAX：0033-1-48379999
CONTRCT NO.161616 DATE：18 AUG.，2006
APPLICANT：HANGZHOU DDD CO.LTD
ADD：5DINGHAI POAD，HANGZHOU，CHINA
TEL：0086-571-8604323
FAX：0086-571-8604322
BENEFICIARY：EEE CO.LTD.
1 AVENUE DU GENERAL LECLERC BP 60
93122LA COURNEUVE CEDEX
FRANCE
TEL：0033-1-483788888
FAX：0033-1-48379999
COMMODITY：WASTEPAPER
PACKING：IN BULK
SHIPMENT：LATEST 30SEPTEMBER 2006 FROM ANY EUROPEAN PORT TO NINGBO，CHINA.
QUANTITY：85MT NET
UNIT PQICE：USD220/MT CFR NINGBO，CHINA
TOTAL AMOUNT：USD18700.00
SAY：U.S.D ELGHTEEN THOUSAND SEVEN HUNDRED
ONLY.
MOREOR LESS 5%OF AMOUNT IS PERMITTED
VALIDITY OFL/C：L/C REMAINS VALID UNTIL 21 OCT 2006 NEGOTIA TION AT COUNTER OF CIC IN PRIS
PARTIAL SHIPMENT：NOT ALLOWED
TQANSSHIPMENT：ALLOWED
SHlPPING MARKS：SELLER’S MARK TO APPLY
L/C WILL BE OPENED DIRECTLY TO oUR BAND IN PARIS：
CIC(CREDIT INDUSTRIELET COMMERCIAL)
ADD：CENTRE MT MONTPARNASSE 7，RUE ARMAND MOISANT，75015PARIS，FRANCE．
TEL：0033-1-44108700
FAX：0033-1-44108788
SWIFT CODE：CMCIFRPP
PAYMENT TERMS：
PAYMENT WILL BE BY TRANSFERABLE IRREVOCABLE DOCUMENTARYCREDIT PAYABLE AT 60 DAYS FROM B/L DATE AGAINST FOLLOWING DOCUMENTS PRESENTATION：
-FULL SET OF CLEANON BOARD MARINE B/L MADE OUT TO ORDER(ISSUED BY SHIPPING COMPANY OR SHIPPING AGENTS).
-COMMERCIAL INVOICE IN TRIPLICATE ISSUED BY BENEFICIARY．
-PACKING LIST IN TRlPLICATE ISSUED BY BENEFICIARY．
-BENEFlCIARY’S CERTIFIED COPY OF FAX DISPATCHED TOTHE ACCOUNTEES WITHIN 1 DAY AFTER SHIPMENT ADVISING THE NAME OFVESSEL，DATE，QUANTITY，WEIGHT AND VALUE OF THE SHIPMENT．
DOCUMENTS TO BE PRESENTED WITHIN 21 DAYS AFTER SHIPMENTAND WITHIN VALIDITYOF THE L/C．
L/C WILL BE OPENED AND RECEIVED IN FRANCE LATEST 04 SEP，2006．
FORCE MAJEURE：
IN CASE OF LATE DELIVERY DUE TO FORCE MAJEURE，THE TIME OF SHIPMENT MIGHT BE DUELY EXTEND，OR ALTERNATIVELY A PART ORWHOLE OF THlS CONTRACT MIGHT BE CANCELLED.IN CASE THE ACCIDENT LASTS FOR MORE THAN 4 WEEKKS，THE BUYER SHALL HAVE THE
RIGHT TO CANCEL THE C()NTRACT．
BUYER：HANGZHOU DDD CO.LTD
LI TIAN
SELLER：EEE CO.LTD.
MIA PHONG