月球的引力是地球引力的六分之一，所以嫦娥四号的实验是一个测试：地球上的植物能知道月球上哪个是向上的方向吗？
The moon's gravity is a sixth as strong as the earth's, so Chang'e-4's experiment was a test: would the earth plants know which way was up on the moon?
在所有的能源技术里，核能源所经受的测试可能是最严厉的，而迄今为止，它对人类和地球的影响很小。
Atomic energy has just been subjected to one of the harshest of possible tests, and the impact on people and the planet has been small.
在2010年，“耐力”机器人在地球南极洲结冰的西邦尼湖上完成了六个月的测试。
In 2010, the ENDURANCE robot completed six months of tests here on Earth, at a frozen lake in Antarctica called West lake Bonney.
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