rudimentary

The shipwrecked sailors built a rudimentary shelter using palm leaves and pieces of wood.

(Chinese) 遇难的船员们用棕榈叶和木块搭建了一个简陋的避难所。

He only has a rudimentary knowledge of French, so he can order food but not hold a conversation.

(Chinese) 他只具备初步的法语知识，所以他可以点餐，但无法进行对话。