尽管一再做出全球承诺，要保护地球上的物种和生境及其提供的货物和服务，但生物种类继续以史无前例的速度减少。
Despite repeated global pledges to protect the planet's species and habitats -and the goods and services they provide -the variety of life on Earth continues to decline at an unprecedented rate.
康内斯托加式宽轮篷车的白色帆布保护货物免受恶劣天气的侵袭，篷车的底座上有很多拱形的木箍，帆布就绷在其上。
The white canvas cover on the Conestoga wagon protected the freight from inclement weather; it was stretched taut over a series of wooden hoops that arched over the wagon bed.
对于保护许多为人类提供食物和其他基本货物和服务的生态系统也是必不可少的。
It is also essential for maintaining many of the ecosystems which provide our food and other essential goods and services.
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