原来她是个模特儿，难怪她身材那么好。

Yuánlái tā shì gè mótèr, nánguài tā shēncái nàme hǎo.

It turns out she is a model, no wonder her body shape is so good.

难怪他拒绝了邀请，他有其他安排。

Nànguài tā jùjuéle yāoqǐng, tā yǒu qítā ānpái.

No wonder he declined the invitation. He has other plans.

难怪他生气了，你一直在打扰他。

Nànguài tā shēngqìle, nǐ yīzhí zài dǎrǎo tā.

No wonder he's angry. You've been disturbing him all along.