To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
and explain them. That's why we 
spend every day researching.
.ثمّ شرحها. لهذا السبب نقضي كلّ يومٍ في البحث
Das ist die Forschung,
die wir täglich betreiben.
y explicarlos después
de investigar todo el día.
y encontrar su porqué después
de investigar todo el día.
par l’analyse mathématique.
e spiegarli. Ecco perché facciamo ricerche ogni giorno.
e explicá-los. É para isso que
passamos os dias pesquisando.
и объяснении. 
Мы занимаемся этим каждый день.