More N2 vocabulary

• 点々てんてんhere and there, little by little
• 直流ちょくりゅうdirect current
• 突っ込むつっこむto plunge into, to go into deeply
• 見学けんがくinspection, study by observation, field trip
• 量るはかるto measure, to weigh, to survey
• のこぎりsaw