new moon
US /nuː muːn/
UK /nuː muːn/

1.
新月
the phase of the moon when it is in conjunction with the sun and invisible from Earth, or shortly thereafter when it appears as a slender crescent.
:
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The sky was dark, signaling the arrival of the new moon.
空は暗く、新月の到来を告げていた。
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Many cultures celebrate festivals during the new moon.
多くの文化では新月の間に祭りを祝う。