Helite (edna)
[化] N,N'-二硝基乙二胺; 乙二硝胺; 海來特
??? 情景例句
Yes. I'll hold. He's checking. You do?
好， 我會等。他正在查。真的有了？
John had a rough time last night.
約翰昨晚好像挺轟轟烈烈的樣子。
The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
而開發(fā)這樣一臺望遠鏡將會是21世紀天文學的一個重要的研究課題。