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，主要是由于糧食問(wèn)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(guò)去，毀林開(kāi)荒對解決糧食問(wèn)題曾經(jīng)發(fā)揮了重要作用，但同時(shí)也成為生態(tài)惡化的重要原因。
