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The screw on the machine seems loose; you need to tighten it up.
这机器的螺丝钉松了，你要上紧。
youdao
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Move the feed DOG up or down to perform adjustment, then securely tighten the screw.
上下移动送布牙调节高度，然后拧紧紧固螺丝。
youdao
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Move the feed DOG up or down to perform adjustment, then securely tighten the screw.
上下移动送布牙调节高度，然后拧紧紧固螺丝。
youdao