But there's a huge variety of equally convenient reasonably healthy food.

不过，健康食品也同样品种繁多。

Plotz thinks the oxpeckers may have evolved their sentinel behavior because it protects their convenient food source.

普洛茨认为，牛椋鸟可能为了保护方便的食物来源，而进化出哨兵行为。

There's also the option of buying ready meals – convenient food that comes at a price.

还可以选择购买即食食品——价格实惠的方便食品。