有时候在大城市里会感到孤独。

Yǒushíhòu zài dà chéngshì lǐ huì gǎndào gūdú.

Sometimes, one may feel lonely in a big city.

孤独并不意味着寂寞。

Gūdú bìng bù yìwèi zhe jìmò.

Solitude does not necessarily mean loneliness.

老人常常感到孤独和无助。

Lǎorén chángcháng gǎndào gūdú hé wúzhù.

Elderly people often feel lonely and helpless.