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trough of a wave▼noun[UK: trɒf əv ə weɪv] [US: ˈtrɒf əv ə ˈweɪv]
trough of the sea▼noun[UK: trɒf əv ðə siː] [US: ˈtrɒf əv ðə ˈsiː]
ups and downs▼[UK: ʌps ənd daʊnz] [US: ˈəps ænd ˈdaʊnz]
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