If you go surfing, you will rise and fall with the waves.
如果你去冲浪，你会随波浪起伏。
They both fall with the acceleration g.
他们都以加速度g向下坠落。
Allow your belly to rise and fall with each inhale and exhale.
腹部随着每次的呼气、吸气而鼓起、落下。
Drop the barometer and time its fall with a stopwatch.
扔下气压表，用秒表测出它降落的时间。
Experts say birth rates do appear to fall with economic declines.
专家说，出生率确实会随着经济的下滑而下跌。
Experts say birth rates do appear to fall with economic declines.
专家说，出生率确实会随着经济的下滑而下跌。
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