这位物理学家推导出一个复杂的公式来描述粒子的行为。
The physicist derived a complex ___formula to describe the particle's behavior.
首先,在B2单元格中输入正确的公式来计算平均值。
First, enter the correct ___formula into cell B2 to calculate the average.
水的化学式H2O,是地球上所有生命的基础。
Water's chemical ___formula, H2O, is fundamental to all life on Earth.