He made me grin from ear to ear.

他使我裂嘴大笑。

Further it said "Mark has never used the phrase 'all grin from ear to ear'" which occurred in the letter.

而且“马克也从来不会使用‘all grin from ear to ear’这个短语，”但它在信中也出现了。

But as we dropped down to Boullion in Belgium, we were rewarded with mile after mile of endless switchbacks through lush forest; I couldn't help but grin from ear to ear.

但是当下坡来到比利时的博莱昂时，我们得到的回报是在茂密的森林中骑过了无数个折弯，我不由得笑得合不拢嘴。

In 2015, there was no shortage of moments that made us grin from ear-to-ear.

2015年的确有不少让我们笑得合不拢嘴的时刻。