Divination by five-signs became very popular during the Tang dynasty, and lasted till the Songdynasty.
目前所见文献中明确谈及五兆卜法的时间是在唐代，唐代文献的记载表明，五兆卜法在唐初已经甚为盛行，且与龟卜、易占、式占被唐代官方列为四大卜筮正术，足见其在占卜术中的地位之高。
tera hertz
兆兆赫兹, 兆兆周
An omen or foreboding, especially of evil.
预示，预兆，凶兆预兆或凶兆，尤指不幸的
"boding:an omen or foreboding, especially of evil."
预示,预兆,凶兆:预兆或凶兆,尤指不幸的。
an event of good [bad] omen
吉 [凶] 兆的事
Of or being an omen, especially an evil one.
预示的预兆的或成为预兆的，特别是坏的预兆的
Gigabit Ethernet (2)
千兆位以太网（2）
Gigabit Ethernet (1)
千兆位以太网（1）
MB (megabyte)
兆字节,[台]万字节
portentous events, signs
不祥的事件、 徵兆.
sign of the existence of sth bad
（坏事的）徵兆, 徵候
Mega: Million. Abbreviated "M".
兆:一百万的词冠。
a rift within the lute
不和[疯癫]的前兆
It was an omen among omens, pointing a path for him to tread.
这是预兆中的预兆，指引着他走一条路。
GB: Abbreviation for Gigabyte.
千兆字节:英语是千兆字节的符号。
Mega-Hz~100Mega-Hz,HR analog video,K-M bit rate.
1兆赫兹~100兆赫兹，高分率频比视频，1千比特~1兆比特。
TEDA Broad Band Network can provide a rate of 1000 MB to the community, 100MB to the building and 10 MB to the family.
天津开发区宽带实现“千兆到小区、百兆到楼宇、十兆到家庭”。
First sign of old age."
衰老的第一个征兆。”
These were warning signs of a storm.
这是暴风雨的前兆。