Merchant ships salute each other by dipping the flag . 商船互相点旗致敬。
The president said that the baltic should be free to all nations for merchant shipping . 总统说,波罗的海应当对各国商船开放。
However, the american reinforcement of destroyers turned the tide in july, and convoys for merchant ships were begun . 然而,美国驱逐舰增援在7月间改变了这种情况,开始了对商船的护卫。
Secretary stimson urged roosevelt to order the navy to convoy british and allied merchant ships all the way from american to british ports . 史汀生部长力促罗斯福下令海军对英国与盟国船队从美国港口到英国港口进行全程护航。