cover a year

• 达一年； 历时一年

cover a year的用法和样例：

例句

1. In a year,your share of the solid waste amounts to nearly one metric ton.
   一年内你所丢弃的那份固体废料几乎达一公吨。
2. It then took up to 7 a year for the piglet cells to mature and start producing full quantities of insulin.
   这些小猪细胞此后需要多达一年的时间发育成熟，并开始产生足量的胰岛素。
3. The construction of this canal took one year.
   这条运河历时一年才修建成功。
4. This company spent a year developing this card punching system buses.
   这家公司历时一年才开发出这套公共车刷卡系统。