we owe a lot to birds and beasts (who eat insects)——这是宾语从句.
but后面是并列句.
all of them (put together后置定语,put是过去分词) kill(谓语)
only a fraction of the number destroyed by spiders.
we owe a lot to birds and beasts (who eat insects)——这是宾语从句.
but后面是并列句.
all of them (put together后置定语,put是过去分词) kill(谓语)
only a fraction of the number destroyed by spiders.