根据以下业务背景资料。回答以下相关问题。
浙江金苑有限公司(Zhejiang Jinyuan CO.，Ltd.)是一家流通性外贸企业，2006年9月18日与英国ROSE CO.，Ltd.签订一份订购合同如下：
　　　　　　　　　　　　　PURCHASE CONTRACT
　　　　　　　　　　　　　　　　　　　　　　　　　　　P/C N0.：R060121
　　　　　　　　　　　　　　　　　　　　　　　　　　　 DATE：18 SEP．2006
THE SELLER：Zh@ang Jinyuan CO.，Ltd．　　　 　　THE BUYER：ROSE C0.，Ltd．
ADDRESS：NO．18 Tlanshan Road 　　　　　　　　ADDRESS：NO.5 Raul Street
Hangzhou，China 　　　　　　　　　　　　　　　　　London，U.K.
We hereby confirm having sold to you the following goods on terms and conditions asstated bellows：
DESCRIPTION OF GOODS：
Ladies coat(女式风衣)，style no.：118899
Shell：woven twill 100%cotton 22^s×18^s/130×64 stone washed
Lining：i00% polyester 230T
Paddin9：100% polyester，body 1209/m²，sleeve 1009/m²．

Size	S	M	L	XL	XXL	Total
Black	640	600	500	360	300	2400
Red	640	600	500	360	300	2400
Total	1280	1200	1000	720	600	4800

Size Specification	S	M	L	XL	XXL	Tolerance
1/2 chest	60cm	62cm	65cm	68cm	71cm	+1cm
1/2waist	57cm	59cm	62cm	65cm	68cm	+1cm
1/2hip	62cm	64cm	67cm	70cm	73cm	±1cm
1/2bosom	64cm	66cm	69cm	72cm	75cm	±1cm
Shoulder	85cm	85cm	85cm	88cm	88cm	±1cm
Armhole straight	25cm	25.5cm	26cm	26.5cm	27cm	±0.5cm
Sleeve length	62cm	62cm	62cm	62cm	62cm	±1cm

PACKDING： 10 pieces of coats are packed in one export standard carton，sofid color and size in thesame carton． Maximum size of export cartons： Length Width Height 56cm 38cm variable Maximum gross weight of a carton；15kgs MARKS： Shipping mark includes ROSE，P/C n0.，style n0.，port of destination and carton no.． Side mark must show the shell color，the size of carton and pieces per carton． SAMPLES： These items will have to be dispatched by DHL，prepaid．Please advise dispatch details to US immediately．

TYPE 0F SAMPLE	QUANTITY	ETA LONDON
Lab dipsandaccessory material samples	2 sets respectively for approval	DirectIy!After the contract date
Approval samples	3pcs sizeMand2"pcs sizeS	2 weeks after the contract date
Pre-production samples	3 pcs size M	Waiting for our instruction
Production samples	2pcs sizeM	Before defivery

The pre-production samples could be made after the fabric has been tested and passed bySGS，Shanghai Branch．then will be sent to customers’quality assurance department．“Go”for production Call only be given after their approval． DELIVERY． 2 same Iots of Ladies coat(the same colors and sizes)：

Port of destination	Quantity	Earliest delivery date	Latest delivery date
London	2400pcs	30Sep.2006	15Oct.2006
Rotterdam	2400pcs	200ct.2006	10Nov.2006
Total	4800pcs

PoRT OF’LoADING：Shanghai
PoRT oF DESTINATloN：London/Rotterdam
UNIT PRICE：USD20.00 per piece CIF London/Rotterdam
QUANTITY：4800pcs
AMOUNT：USD96000.00
more or less 5% of the quantity and the amount are allowed．
TERMS OF PAYMENT．
30% T/T in advance．70% L/C at 30 days after B/L date opened through a bank accept able tO the seller valid for deferred payment in China until 20 Nov．2006．
INSURANCE：
To be covered by seller for 1 10% of CIF value against All Risks and War Risks as per CIC of
PICC dated 01/01/1981．
PURCHASE CoNDlTIONS：
All garments’manufacturers must meet the minimum manufacturing standards，comply with the SA8000．AZO-colors embroidery and nickel press buRon are prohibeted．
The material composition of each article has tO be advised on the sew——in label in following
languages：Spain and English．If the labeling of the goods is not correct，we will debit the supplier
3% of the purchase price．
Place of performance and court ofj urisdiction：London．U．K．
SIGNATURE：SIGNATURE：
(SELLER) (BUYER)
订购合同审查操作
阅读理解本订购合同内容，把下列条款翻译成汉文并回答相关问题。

(1) 翻译下列条款 TERMS 0F PAYMENT． 30% T/T in advance，70% L/C at 30 days after B/L date opened through a bank acceptable to the seller valid for deferred payment in China until 20 Nov．2006． (2) 回答下列问题 ①受益人是否一定要向银行提交汇票为什么 ②假如该条款的付款时间改为“at 30 days after sight”，对浙江金苑有限公司是否有利为什么