She has a boyfriend she's been going out with since high school but feels their relationship has become a matter of habit and is increasingly dissatisfied.
If your ability to accomplish a job does not exceed the peak (hump), on the difficulty scale for one job (project), then no matter how long you wait it will not be solved.
ひとつのヒントに目を輝かせた女の子は、可愛らしい猫型のシャープペンシルをノートに走らせていく。
The girl, her eyes shining brightly from that single hint, makes her cute cat-motif automatic pencil run across her notebook.
昔はペチャパイだったのに、いつの間にかこんなに大きくなりやがって。
She used to be flat-chested - just when did she get so large?
旧システム用に書かれたソフトとの上位互換性を保つのは大切です。
It is important to maintain backward compatibility with software that was written to run on the former system.