grain problems的用法和樣例：
例句
- The tense situation in the countryside last spring was chiefly due to the grain problem.
我們今年春季農村的緊張情況，主要是由於糧食問題引起的。 - In the old time, while the devastation of forests for arable land helped ease grain shortage, it became a main factor causing ecological deterioration.
過去，毀林開荒對解決糧食問題曾經發揮了重要作用，但同時也成為生態惡化的重要原因。
