According to the fallingrate, the content of mercury in the deposit will reach the background value after 32.57 years.
按此下降速率,沉积物的汞含量经32.57年可达到背景值水平。
2
The preservative distribution is relative to the pressure and its fallingrate. The optimum temperature and time for treatment vary with the species of wood.
处理过程中的压力及处理结束时的卸压时间对防腐剂分布影响较大,而最佳处理温度、时间则随树种而异。
3
Worse, the numbers are now falling at an accelerating rate.