Good power density means a shape like a peanut butter jar, easy to fill or empty; low power density is more like a wine jug with a narrow neck.
电能密度好的就像花生酱罐子口，很容易装满或倒空；电能密度差的就像窄瓶口的酒壶。
Piani was taking the wooden cork out of a big wicker-covered wine jug.
皮安尼把一个大酒瓮的木塞子拨了出来，酒瓮外用柳条包好。
Piani was taking the wooden cork out of a big wicker-covered wine jug.
皮安尼把一个大酒瓮的木塞子拨了出来，酒瓮外用柳条包好。
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