New words：
distinguish [dɪˈstɪŋɡwɪʃ] v.区分；辨别；分清；
Sample Sentences：
It was hard to distinguish one twin from the other.
I could not distinguish her words, but she sounded angry.
The male bird is distinguished from the female by its red beak.
New words：
agenda [əˈdʒendə] n.议事日程；议程；议程表
Sample Sentences：
Let’s follow the agenda to save time.
We need to finish the agenda before 5 o’clock.
For the government, education is now at the top of the agenda.
New words：
virus [ˈvaɪrəs] n. 病毒
Sample Sentences：
So far they have not found a way to fight the virus.
This software is designed to scan all new files for viruses.
Like the flu virus, a computer virus can spread all over the world.
New words：
bacteria [bækˈtɪriə] n. 细菌（复数）bacterium [bækˈtɪriəm] n. 细菌（单数）
Sample Sentences：
All bacteria are larger than viruses.
The bacteria are harmless to humans.
Soap destroys the cell walls of bacteria.
virus [ˈvaɪrəs] n. 病毒
New words：
thus [ðʌs] adv. 因此；于是；所以；这样；如此
Sample Sentences：
He studied hard, thus he passed the exam.
The team worked well together, thus winning the game.
Hold the pen thus, and you’ll write better.
The problem can be solved thus, as I showed you.