oceans 海洋 hǎi yáng
oceans of the world 世界的 海洋 shì jiè dì hǎi yáng
Odyssey
OECD
Ohm's Law
OMR
One Belt One Road Initiative
one country's ...
one man's meat (food) is another man's poison
open source software
operating system
operating systems, types of
oracle bones 甲骨文jiǎ gǔ wén
oracle bones 甲骨文 recognition
orange 橙子 chéng zi
Orang Asli
Orang Asli Museum, Malaysia
Orang Asli Crafts Museum, Malaysia
orde kosmos
origami
Oryza sativa
ostrich
otak otak
out on a limb
output devices
over the bridge noodles 过 桥米线 guò qiáo mǐ xiàn
oviparous
oxidation of ethanol
oxidation of ethanol using acidified potassium dichromate (VI)
oxidation-reduction: electrochemical cells
oxygen
oxygen, properties of