The last few decades have also witnessed flourishing developments in planetary exploration : unmanned automated probes were sent to study far - flung planets such as uranus and neptune , which are more than a billion kilometres from us 近数十年来，无人驾驶的太空探测器甚至飞越距离我们超过10亿公里的天王星及海王星。
China youth daily reported on monday that many people felt disappointed the china national tourism administration ( cnta ) didn ' t seek public opinion about an issue that affects more than a billion people 据《中国青年报》本周一报道，很多人对国家旅游局在调整这一关乎十多亿人的制度之前不听取公众意见的做法感到失望。
