及物动词
1. The fence was strengthened with wire. 这堵围栏用金属丝加固了。
2. It is a systematic attempt to strengthen our competitive ability. 那是为增强我们的竞争能力而作的有计划的努力。
3. Our enemy has greatly strengthened during the truce talks. 和谈期间,敌人力量已大为增强。