Her erratic mood swings made it difficult for us to plan the surprise party, as we never knew if she'd be cheerful or upset.
🔊她反复无常的情绪波动让我们很难策划惊喜派对,因为我们永远不知道她是会开心还是会难过。
The erratic rainfall this year has been a challenge for local farmers, with some weeks of drought followed by sudden heavy storms.
🔊今年不规则的降雨对当地农民来说是个挑战,几周干旱之后又突然出现暴风雨。