The reduction depended on the amount of tansy planted in the fields.

减少的数量取决于种植的艾菊的数量。

North American herb with bitter - tasting pinnate leaves resembling those of tansy.

北美的一种草本植物,类似水芹,但叶象艾菊叶.

Tansy and pennyroyal were also popular, but they tended to poison the woman who ingested the herb.

艾菊和薄荷油也很流行，但它们趋于毒害了那些服用草药的女人。

Studies conducted later in a laboratory show that tansy can produce a natural chemical that keeps the potato beetle at a distance.

迟些实验室中的研究显示艾菊产生了一种能够让薯虫保持距离的自然化学物品。