It took two hours to complete the calculation, so we logged off at4 o'clock.
It took two hours to complete the calculation, so we logged off at4 o'clock.
我们用了两个小时才计算完毕，因此我们在4点钟结束了工作。
It took two hours to complete the calculation, so we logged off at4 o'clock.
我们用了两个小时才计算完毕，因此我们在4点钟结束了工作。