1. At the present time the cause of leukemia is not clear.

目前甶血病的病因尚不明了。

2. Treatment depends on the cause and on the symptoms and signs present.

治疗根据病因及所出现的症状和体征而定。

3. The article presents a new approach to the subject.

本文提出对这一课题的新的处理方法。

4. Acute malaria in children rarely present a classic clinical condition.

儿童患急性疟疾很少有典型的临床表现。

5. This present is meant for you.

这件礼物是准备给你的。

6. There is no specific treatment for the disease at present.

目前对此病尚无特殊的治疗方法。