Many children are now born into or raised in one-parent families.现在很多孩子在单亲家庭中出生或成长。Parent birds began to hunt for food for their young.亲鸟开始为幼鸟寻找食物。Ninety per cent of lone parent families are headed by mothers.90%的单亲家庭由母亲...
China was the first country in the world to synthesize crystalline insulin, a bioactive protein.中国在世界上最早用人工方法合成一种有生物活力的蛋白质--结晶胰岛素.There are many amino acids that the body cannot synthesize itself.有许多种氨基酸人体自身不能合成。Etioplas...
他已经张贴了一张“禁止钓鱼”的告示牌。He has posted a sign up that says "No Fishing"她那钓鱼的故事令我心烦意乱.She got on my nerves with her fishing stories.钓鱼的关键就是要有耐心.In fishing , patience is the name of the game....