一根
a length of
例句:
我在一根棍子上刻了一个V字形。
I cut a notch in a stick.
他正用一根牙签剔除牙齿间的饭渣。
He is removing bits of food stuck between the teeth with a toothpick.
她举起一根手指放在唇边，示意肃静。
She raised her finger to her lips as a sign for silence.
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