In addition, last year other astronomers reported a steep metallicity gradient in an even farther galaxy, but that galaxy is not a spiral, so its relevance to the Milky Way is less clear.

另外，去年有其他天文学家报告称在一个更远的星系中发现了较大的金属丰度梯度，但那个星系不是螺旋星系，所以它与银河系的关系就没有那么明确了。

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But it's not clear what makes the human joint so resilient to damage - and resilient in this context means returning to its original shape after being stretched or bent.

但是仍不清楚是什么使得关节弹性加大免于损伤。这里的弹性是指在拉伸弯曲过后恢复到以前的形状。

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The US is not so clear about its intentions right now, but China landing on the Moon later this year and a resurgence of international interest in the Moon could change that.

FORBES: The Moon is a Natural Platform for Asteroid Mining, Detection and Deflection