Seller may increase any price hereunder on the first day of any calendar quarter-yearly period by delivering or mailing written notice to Buyer at least fifteen (15) days prior to such day.
卖方提价可在每个季度的第一天进行，但至少应提前十五（15）天以书面提交或邮寄通知买方。
2
That's equal to a quarter of all the gas used in the United States in a year, 30 percent of the European Union's yearly gas consumption, or 75 per cent of Russia's gas exports.