活性氧类

活 = 氵 + 舌 : Helga Horse joined the traditional water bottle challenge and empties a bottle of water over herself in the observatory's kitchen. To raise the difficulty level, she only uses her tongue to hold the bottle.

性 = 忄 + 生 : Marie Curie had a strong character since she was little. Even in her cradle in the engine's bathroom she was only playing with a flail.

氧 = 气 + 羊 : Maud Younger (y) gave the sheep (羊) a balloon (气) inside of the anglepod (ang3), but unfortunately it doesn't float because it is filled with oxygen (氧).

类 = 大 + 米 : Lancelot (l) wants to save mankind (类), so he plans to breed the perfect rice plant. To find the perfect seed he programmed a robot (大) to classify (类) every corn of a sack of rice (米) in the Eiffel Tower's bathroom (ei4) so he can choose the best one.