Assignment 2

1.switch(v.)

to change suddenly or completely ,especially from one thing to another
or to exchange by replacing one person or thing with another

ex: She started studying English at college, but switched to Business Studies in her second year. 

2.reinforce(v.)

If something reinforces an idea or opinion, it provides more proof or support for it and makes it seem true

ex: The final technical report into the accident reinforces the findings of initial investigations.

3.psychological(adj.)

relating to the human mind and feelings

ex: He claims that the constant aircraft noise has a bad psychological effect on the residents.

4. account for(phrasal verb.)

Provide or serve as a satisfactory explanation

ex: It needs no explanation.

5.disruption(n.)

a situation in which something is prevented from continuing in its normal way because of problems and difficulties

ex: The accident is causing widespread disruption on the roads.

The learners' dictionary is beneficial to me, because it let me know how to explain this word easily. 

Bilingual dictionary is convenient. If I don't know the meaning of the word,I can look up the word quickly, but it is just suitable for beginners .If I want to learn a lot, learners' dictionary is a good choice.I usually use Cambridge learner's dictionary and Yahoo dictionary. Because there are  many example sentences and complete explanations , they are helpful for me to learn english.