primary

The primary goal of the mission is to collect soil samples from the Martian surface.

(Chinese) 这次任务的主要目标是从火星表面采集土壤样本。

Tourism is the primary source of income for the inhabitants of this island.

(Chinese) 旅游业是这个岛上居民的主要收入来源。

Most children in the UK begin primary education at the age of five.

(Chinese) 大多数英国孩子从五岁开始接受小学教育。

The government is investing more money into building new primary schools.

(Chinese) 政府正在投入更多资金建设新的小学。