Semicentennial
a. 五十年一度的, 持续半个世纪的\\nn. 五十周年, 五十周年纪念
✅ 同义词
🗣️ 情景例句
But your L C must reach us 30 days before delivery.
但交货前30天，我们必须要收到你们的信用证。
An hour in the morning is worth two in the evening.
一日之计在于晨。
It landed in the middle of the road.
落在了马路中间。