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drwy’r canrifoedd, mae pobl ewrop wedi hwylio cefnforoedd y byd, wedidarganfod cyfandiroedd eraill, eu harchwilio, masnachu â nhw a sefydlu eu cartrefi yno.
down through the centuries, europeans have sailed the world’s oceans, discovered the other continents, explored them, traded with them and made their homes there.
最后更新： 2014-02-06
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mae'n wir i ddweud , am fod cefnforoedd yn ymateb yn araf , ni ddaw effeithiau llawn yr hyn yr ydym eisoes wedi'i wneud i'r amlwg am 50 mlynedd
it is true that , because oceans respond slowly , the full effects of what we have already done will not be felt for 50 years