1. My Berlin diary for December 2 was limited to four words.
    12月2日我的柏林日记只有4个字。

2. On 3 December 1967 Dr. Christiaan Barnard transplanted the heart of a 24-year-old girl into the chest of a 50-year-old man.
    1967年12月3日，克里斯蒂安·巴纳德医生把一位二十四岁姑娘的心脏移植到了一位五十岁男人的胸内。

3. It is often cold in December, January and February. It snows sometimes.
    12月, 1月和2月通常是寒冷的. 有时还下雪.

4. It´s often cold in December, January and February.
    12月、1月和2月常常很冷，