6이나 7 둘 중에 실을 수 있습니다. 하지만 자기가 가지고 있는 콘을 모두 못 싣는 5짜리 배에는 실을 수 없습니다.

사이즈가 6,7인 배 중 하나를 선택하시면 됩니다.

에에? 5 짜리 배에 아예 못 싣는건가요?;;

보드게임 긱의 영문번역룰에는
You must load if you can. Furthermore you must load all you can, of only one commodity, via the wharf, or on one ship up to its capacity.

그냥 수용 한계까지만 실으면 된다고 나와 있는데요-_-

you must load all you can
"니가 가능한만큼 모두 실어야한다" 라고 되어있네요. ^^

-_-그 뒤 문장은 안 보시나요.; 쉼표로 떨어진 걸 붙여 읽어보세요
you must load all you can on one ship up to its capacity
-ㅂ- 영어는 좀 자신있답니다.

5짜리 배에는 아예 못 싣습니다.
왜냐하면 6이나 7짜리 배가 있기 때문입니다.
아래를 참고하세요. 보드게임긱의 영문매뉴얼 예제입니다.

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Example of a Captain phase (with 4 players): Anna is the captain and begins supplying. She has 2 corn and 6 sugar. The 5 ship and the 7 ship are empty; on the 6 ship are 3 corn. Anna must now supply either both corn, or all 6 sugar; she decides sugar and ships her 6 tokens on the 7 ship (she was not allowed to use the 5 ship). She receives 7 VP (6 + 1 as captain). Benno takes his turn. He has 2 sugar and 3 tobacco. He selects the sugar and places 1 token on the free space in the 7 ship (he could have shipped the 3 tobacco on the 5 ship, however that wouldn’t be best; he would not have any to sell to the Trading Company, which he would prefer). He receives 1 VP. Clara takes her turn. She has 2 corn and 1 tobacco. She decides to ship tobacco and places it on the 5 ship. She receives 1 VP. Donni takes his turn. He has 1 corn and 5 Indigo. He must ship corn on the 6 ship. He receives 1 VP. Anna takes her turn again. She must now ship her two corn on the 6 ship. She receives 2 further VP. Benno also has no more choice, he must place his 3 tobacco on the 5 ship. He receives 3 further VP. Clara and Donni as well as Anna and Benno cannot supply anything more. The first part of the captain phase is therefore finished. Each player’s storage is checked. Afterwards the full 6 and the full 7 ship are emptied. The 4 tobacco goods tokens remain on the 5 ship.

she was not allowed to use the 5 ship
오. 이런 예제가 있었군요.. 감사.^^

그러니까 you must load all you can, of only one commodity, via the wharf, or on one ship up to its capacity. 는 한상품에 대해서 니가 가능한 만큼 모두 실어야되고 하나의 배의 용량한계까지 실을 수 있다. 로 해석해야 적절한 것 같네요.
그러니까 6개짜리 콘을 5,6,7짜리 비어있는 배가 있을 경우 5짜리 배에 싣는 것은 니가 가능한 만큼 모두 실어야 한다는 룰에 어긋나는 것이 아닌가요. 6,7짜리 비어있는 배가 있기 때문이죠. 6,7짜리 비어있는 배에 실으면 위의 조건을 만족할 수 있기 때문에 5짜리 비어있는 배에는 실을 수 없는 것이죠.
6,7짜리 비어있는 배가 없다면 5짜리 비어있는 배에 콘 5개를 실어야 되겠죠. 그래야 위의 조건을 만족할 수 있기 때문이죠.

쩝...'영어는 좀 자신있답니다.'라니... -_-;