基础训练;基础教学the teaching of the basic parts of a subject
a good grounding in grammar
扎实的语法基本功训练
2.
[u][c]
(尤指因机件故障等)(飞机的)留地停飞,(船的)留港停航the act of keeping a plane on the ground or a ship in a port, especially because it is not in a good enough condition to travel