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Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.

The future of drones is not to replace humans, but to help them do their jobs better.

法律是一種反映社會價(jià)值和規(guī)范的社會現(xiàn)象。

History is not the past. It is the present. We carry our history with us.

采礦技術(shù)的創(chuàng)新對于滿足世界的能源需求至關(guān)重要。