At manufacturers wholesale prices this business amounted to $35 million in 1957—not including mechanical pencils.
在1957年，按照商品生产商的批发价格计算，铅笔销售总额达到了三千五百万美元，其中还不包括机械自动铅笔。
Most mechanical pencils can be refilled, but some inexpensive models are meant to be disposable and discarded when empty.
多数自动铅笔可重新装填，也有一些便宜的类型用完后可以丢掉。
Most mechanical pencils can be refilled, but some inexpensive models are meant to be disposable and discarded when empty.
多数自动铅笔可重新装填，也有一些便宜的类型用完后可以丢掉。
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