#书摘 It’s true that if all you care about is the how, you can build useful models. But without the why, you’ll only be parroting, not understanding, let alone eventually moving the field forward with your own contributions. （最后一句是：

“let alone eventually moving the field forward with your own contributions”

拆开：
• let alone：更不用说 / 更谈不上（表示递进，前面都做不到，后面更不可能）
• eventually：最终、长远来看
• moving the field forward：推动这个领域的发展
• with your own contributions：用你自己的成果/贡献

整句意思：

如果你连“真正理解”都做不到，根本谈不上将来靠自己的研究或成果去推动这个领域进步。