智能涌现：给狗加个手不能解决这个问题吗？
Some policymakers think that climate-friendly policies are impeding the adoption of green hydrogen. They should ask scientists to review the evidence.
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This is the message Ackerman shares with youth during outreach at schools and elsewhere.
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香港爆發移民潮幾年後，一些人漸漸融入當地生活，也有不少人碰上不同難關。BBC中文採訪三位分別回流香港、留英爭取永居權利、一家分隔異地的移民。