The research is published in the journal Communications Earth & Environment.
Amanda Blacklock is president of the Selkirk Musical Theatre Group
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特朗普的其他言論也加劇了外界的擔憂，即先前被豁免的商品可能會被加徵新關稅。
Over time, he predicts, "We will see those service levels and speeds and experience improve, and we're already seeing some of that playing out."