4周搞定2000+托福核心词
assignment = as(表加强) + sign(信号) + ment(表名词) = 不断给人信号→布置给学生的作业
signficant = sign(信号) + fic(制造) + ant(...的) = 带有信号的→有意义的，重要的
appraisal = ap(加强) + prais(价值) + al(表名词) = 价值→估价；鉴定
approval = ap(加强) + prov(测试) + al(表名词) = 加强测试以证明可行→批准
信号；暗号
signal
常考释义
When completed, the buck rub is an obvious visual signal to us and presumable to other deer in the area.
完工后，雄鹿擦痕对我们来说是一道明显的标志，对当地的其它鹿来说也可能如此。
来源于：阅读OFFICIAL28 P2n. 信号；暗号
He waited for the signal to speak.
他等着发言的信号。
As soon as it was dark, she gave the signal.
天一黑，她就发出了信号。
They stole it, and they're monitoring police comm signals.
他们偷了它，用来监控警方通讯信号。
来自《机器之心 第1季第5集》
图片源自网络
The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.
最佳的信号不仅取决于其明亮度，还在于它与背景颜色的对比度。
来源于：阅读OFFICIAL17 P2A signal might be most easily seen if it is maximally bright.
如果是色彩极为明亮的信号，可能更容易被看见。
来源于：阅读OFFICIAL17 P2Well, it is kind of like the same way a satellite dish receives its signal, if you are familiar with that.
如果你知道卫星接收盘的接收信号的原理的话，射电望远镜的工作原理和它差不多。
来源于：听力OFFICIAL19 L3When completed, the buck rub is an obvious visual signal to us and presumable to other deer in the area.
完工后，雄鹿擦痕对我们来说是一道明显的标志，对当地的其它鹿来说也可能如此。
来源于：阅读OFFICIAL28 P2Another visual signal produced by while-tailed deer is termed a buck scrape.
白尾鹿制造的另一种视觉信号被叫做雄鹿刮痕。
来源于：阅读OFFICIAL28 P2The butterflies can smell, well, ants leave behind pheromones, a special chemical signal.
蝴蝶可以闻到，很好，蚂蚁留下信息素，一种特殊的化学信号。
来源于：听力OFFICIAL48 L5vi. 发信号；示意
He seemed to be signalling, but I didn't understand what he wanted me to do.
他似乎在向我示意，但我不明白他想让我做什么。
He signalled for the bill.
他示意结账。
vt. 向…发信号；示意
Signal the driver to move off.
示意司机离开。
By this means, they signal their level of aggression or readiness to mate.
通过这种方式，它们可以传达出攻击程度和交配意愿。
来源于：阅读OFFICIAL17 P2n. 信号【无线电,电视,电信】
A thin cable carries the signal to a computer.
一根细电缆将信号传送给一台计算机。
n. 信号灯；指示灯【铁路】
We were held up for ages at a signal just outside Waterloo.
我们在滑铁卢站外的信号灯那里停了很长时间。
n. 信号；迹象；预示
They saw the visit as an important signal of support.
他们把这次访问看作是支持他们的重要信号。
vi. （开转向灯）示意；发转弯信号
If you're going to turn, you're supposed to signal.
如果要转弯，应该打转向灯示意。
vt. 传达；表达
He signalled his dissatisfaction.
他表达了不满。
vt. 标志着；是…的标志
The outcome of that meeting could signal whether there truly exists a political will to begin negotiating.
会议结果将昭示是否确实存在开始谈判的政治意愿。
adj. 出色的；显著的；重大的<正式>
Mathematics is crucial component of our culture. It can and should make a signal educational contribution.
数学是我们文化中极为重要的一个组成部分, 它能够也必将作出显著的教育上的贡献。
vt. （开指示灯）示意
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