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.

治療根據(jù)病因及所出現(xiàn)的癥狀和體征而定。

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

本文提出對這一課題的新的處理方法。

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

兒童患急性瘧疾很少有典型的臨床表現(xiàn)。

5. This present is meant for you.

這件禮物是準(zhǔn)備給你的。

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

目前對此病尚無特殊的治療方法。