回答

・the average life span(or expectancy)

ex.What is the average life span of this breed?(這個犬種的平均壽命是多長？)
the average life span/expectancy=平均壽命
breed=犬種
expectancy=預期壽命、期望

ex.It is said that the average life expectancy of Taiwaness people is 80 years old.
(據說台灣人的平均預期壽命是80歲。）
☆It is said (that)～＝ ～被說是

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