①【例】Copies of the relative shipping documents are being air mailed to you in a separate cover together with the operation manual.
②under cover（附在信中）和under separate cover（在另函或另包内）已形成习惯用语（idioms），其中cover前不用冠词。
【例】We have received, under cover, a detailed pricelist of light industrial goods available for export.
【例】We have arranged the necessary insurance cover.
①【例】The prices quoted in the brochure cover packing and are subject to 35% trade discount.小册子所列的价格包括包装费在内，可有35%的商业折扣。
【例】We are pleased to inform you that the goods covered by your L/C No.1002 has been placed on board s.s. “Peace”.
【例】No doubt there must have been some reason for the delay in shipment. To cover this contingency we e-mailed you on July 15 that we were extending the L/C for two weeks.
【例】If you insist on your original quotation, we will have to cover our requirements elsewhere.如你方坚持原报价，则我们不得不从其他方面购进我们需要的货品。
【例】We advise you to lose no time in covering your season’s requirements.
【例】My travel allowance won’t cover the trip.
【例】Please cover [insure] for us the following commodities: ...
【例】Please hold us covered for [on] the commodities listed on the attached list.
【例】Enclosed you will find one copy of our insurance certificate covering All Risks and War Risk.
【例】In order to cover [reimburse] yourselves for the expenses, you may draw on us at 90 days’ sight.
【例】We want a policy with a more extensive coverage.
【例】Regarding insurance, the coverage is for 110% of the invoice value up to the port of destination.
【例】There is a wide variety of standard types of coverage.
【例】The Letter of Credit covering the above-mentioned goods will be established immediately.关于上述货物的信用证将立即开出（注：此句中的cover也可译成“购买”）。
【例】The Buyer shall establish the covering Letter of Credit before May 15.