1.John gave a very exposition of the facts.

1.约翰解释得很清楚。

2.His pictures were shown at the Paris exposition of 1878.

2.他的画在1878年巴黎博览会上展览过。

3.This thesis makes an exposition of the mathematics logicism thought of Russell ,the great mathematician and logician in phytogeny of logic.

3.文对伟大的数家和家伯特兰·罗素的数主义思想进行了研究和探讨。