Apple seeds for instance contain a chemical that releases cyanide when it comes into contact with digestive enzymes.

例如苹果籽含有苦苷（amygdalin，或扁桃苷），一旦遇到动物的消化酵释出氰化物。

The explanation is that occasional individual almond trees have a mutation in a single gene that prevents them from synthesizing the bitter-tasting amygdalin.

解释是，偶尔个别的单个基因发生突变，导致它们无法合成苦味的苦苷。

Most wild almond seeds contain an intensely bitter chemical called amygdalin, which (as was already mentioned) breaks down to yield the poison cyanide.

大多数野生种子含有一种叫做苦苷的强烈苦味化学物质，它（如前所述）分解产生有毒的氰化物。