The other Japanese vegetables have be polluted,
由於日本蔬菜受到輻射的污染, ( 這句我沒有加 due to 和 radioactive 不知怎加上去 ) ( 唔通唔要 polluted, 直接用 radioactive )
In order to ensure that our all vegetables are fresh, They are should check aginst from where.
為了保証我們所有的蔬菜都是新鮮, 所有蔬菜都要 check 清楚來自那裡.
Please check against grammar with sentences above.