You leave me alone in the world.

你把我独自留在了世界里。

I miss you more than you will ever know.

我想你，远超你所知道的。

The heart is a place where love never dies.

心是一个爱永不消逝的地方。

Distance is not a measure of love, it's a measure of courage.

距离不是衡量爱的标准，它是衡量勇气的标准。

I smile when I think of you, but cry when I miss you.

我想你时会微笑，但想念你时会流泪。

Life is short, love is long.

生命虽短，爱却绵长。

Sometimes, the best memories come from the worst times.

有时候，最美好的回忆来自最痛苦的时刻。

We all live in the past, remembering and forgetting.

我们都生活在过去，回忆和忘记。

Who travels for love finds a thousand miles not longer than one.

为爱奔波的人会发现，一千英里并不比一英里更长。

Love makes man grow up or sink down.

爱情，要么让人成熟，要么让人堕落。

这些句子涵盖了失去、思念、爱情和成长等主题，适合初中生表达和理解伤感情绪。