ebb and flow

US /ˈɛb ənd ˈfloʊ/
UK /ˈɛb ənd ˈfloʊ/
"ebb and flow" picture
1.

pasang surut, naik turun, fluktuasi

the recurrent or rhythmical pattern of coming and going or decline and regrowth

:
The ebb and flow of the tides is a natural phenomenon.
Pasang surut air laut adalah fenomena alam.
Life has its own ebb and flow, with good times and bad.
Hidup memiliki pasang surutnya sendiri, dengan masa baik dan buruk.