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INTERMEDIATE LEVEL
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OXF3000N 
có hiệu lực có hiệu quả 
efficient
like: có hiệu quả → →
We can try that—but whether it'll work is another matter. ☊ another ☊
it is demonstrated that...: It has been demonstrated that this drug is effective. ☊ demonstrate ☊
drugs that are effective against cancer ☊ effective ☊
The company must reduce costs to compete effectively. ☊ effectively ☊
For maximum effect do the exercises every day. ☊ maximum ☊
The experiment had the reverse effect to what was intended. ☊ reverse ☊
In order that training should be effective it must be planned systematically. ☊ should ☊