1 an illness that is caused by a bacterium or virus, or the bacterium or virus that causes it -- 感染症, (感染症を引き起こす)バクテリア、ウィルス
a stomach bug
2 a mistake in a computer program -- (コンピュータプログラムの)バグ, 不具合, 欠陥
3 a very small device, fixed on to a phone or hidden in a room, that allows you to listen to what people are saying without them knowing -- 盗聴器
4 to put special equipment somewhere in order to listen secretly to people’s conversations -- ~に盗聴器をしかける, ~を盗聴する
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
道路がどれだけ長くても、一歩一歩完了することができますし、足跡をマークしなければ、道路がどんなに短くても完了することはできません。