For instance, the early Norwegian efforts were so hushed that they were kept a secret even from the Americans for the first two years.
به‌طور مثال، تلاش‌های اولیه‌ی نروژی‌ها چنان خاموش و بی‌صدا بود که حتا در دو سال اول از امریکایی‌ها نیز مخفی نگهداشته شدند.