Hydrofluoride
氢氟化物
🗣️ 情景例句
but I don't want to put it off too long.
但我希望不要拖得太久。
Nothing is difficult to the man who will try.
世上无难事，只要人肯试。
Collecting, by occupying spare time so constructively, makes a person contented, with no time for boredom.
收藏活动通过富有建设性地利用业余时间使人感到心满意足，不再有无聊之日。