双解例句
小知识
Something periodic happens only occasionally, after a “period” of time. Lunch happens every day, after 4th period, so it's safe to say it's periodic. Something periodic doesn't have to happen at regular intervals, though.
The word “period” is the key to the meaning of periodic, because something periodic can happen only after a period of time. Periodic visits to the vet are a good way to make sure that your pet stays healthy. Why not just use “occasional,” you ask. Good question. Periodic implies that the thing will continue to happen over and over—periodically. Like comets and victories by the Yankees. These things are reliable, if periodic.
实用短语
常用短语
单词用法
词根词缀
词根: od
1. =way,表示”路,走”; 2. 表示”电极”
adj.
periodic 周期的, 定期的period周期+ic……的→adj.周期的, 定期的
n.
anode [电]阳极, 正极an上+ode电极→n.[电]阳极, 正极
cathode [电]阴极,负极cath下+ode电极→n. [电]阴极,负极
diode 二极管di两个+ode电极→两个电极→二极管
method 方法,办法meth=meta+od路,走→n.方法,办法
period 时期, 学时,周期peri周围+od路,走→走一周
periodical 期刊,杂志periodic周期的+al物→n. 期刊,杂志
同义词
同根词
词根:period
adj.period某一时代的
periodical[数] 周期的;定期的
adv.periodically定期地;周期性地;偶尔;间歇
n.period周期,期间;时期;月经;课时
periodical期刊;杂志
periodicity[数] 周期性;频率;定期性