[译] 我们高效率的新机器价格便宜得多。
[误] Our effective new machines are much cheaper.

[正] Our efficient new machines are much cheaper.
[注] efficient 意为"效率高的"、"有能力的"，而 effective 作"有效的"解。如：He is an efficient engineer. 他是一位能力强的工程师。/Some medicinal herbs are more effective than chemical drugs. 某些草药比化学药物更有效。