word
1. acoustic (adj.): relating to sound or hearing
example sentence:
The device converts acoustic waves to image for portraiting surrounding.
2. activate (v.): to cause something to start
example sentence:
Activate the facility by clicking the button.
3. frequency (n.): the number of times that a wave, especially a light, sound, is produced within a particular period
example sentence:
Everyone has he(her) own voice and produces the sound in unique frequency.
4. lethal (adj.): sufficient to cause death
example sentence:
This kind of chemical material is lethal so keep it away from kids.
5. temporarily (adv.): lasting for only a limited period of time
example sentence:I just stay here temporarily because I have to go to the next place soon.
other:congress/senate
(congressman/senator)
The Bicentennial man-->"Bi-":2
"Bio-":life
1 I
5 V
10 X
50 L
100 C
500 D
1000 M
example: 2016-->MMXVI/49-->XLIX/99-->XCIX/40-->XL/90-->XC
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