researcher

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

research & development; R&D

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school

mud.

blackfly

classical Japanese dictionary

右横書き: writing from right to left

writing from right to left, such as for Arabic or Hebrew, or for older Japanese signs

paddle (to propel something through water with a paddle, hands or similar instrument) / pedal (a bicycle) / swing (on a swing)