He felt weak after a long day of work and lack of sleep. （经过漫长一天的工作且睡眠不足后，他感觉很虚弱。）

The old man has a weak heart and needs to be careful. （这位老人心脏不好，需要格外小心。）

Her voice was so weak that I could hardly hear her. （她的声音如此微弱，我几乎听不见。）

The team's defense is weak this season, conceding many goals. （这个赛季球队的防守很薄弱，失了很多球。）

Weak sunlight filtered through the thick clouds. （微弱的阳光透过厚厚的云层洒下来。）

You look weak. Are you feeling unwell? （你看起来很虚弱。

你不舒服吗？） The rope is too weak to hold such a heavy weight. （这根绳子太细了，承受不了这么重的东西。）

She has a weak immune system and often gets sick. （她的免疫系统很弱，经常生病。）

His argument is weak and lacks solid evidence. （他的论点很薄弱，缺乏确凿的证据。）

The economy is still weak despite some government measures. （尽管政府采取了一些措施，经济仍然疲软。）

The signal on my phone is weak in this area. （在这个地区我手机的信号很弱。）

The plant is weak because it didn't get enough sunlight. （这株植物很弱小，因为它没有得到足够的阳光。）

He made a weak attempt to solve the problem but gave up quickly. （他对解决这个问题做了微弱的尝试，但很快就放弃了。）

The coffee here is too weak for my taste. （这里的咖啡对我来说太淡了。）

The weak foundation caused the building to tilt. （薄弱的地基导致这座建筑物倾斜。）

She has a weak personality and is easily influenced by others. （她性格软弱，很容易受别人影响。）

The weak current can't power this large machine. （微弱的电流无法驱动这台大型机器。）

The boxer seemed weak in the later rounds of the match. （在比赛的后几轮，这位拳击手显得很虚弱。）

The weak bridge is in need of repair. （这座不牢固的桥需要修理。）

We should help those who are weak and vulnerable in society. （我们应该帮助社会上那些弱势群体。

）