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r16: explosive when mixed with oxidising substances
please take the official translations! you find them here: http: // europa. eu. int/ eur- lex/ lex/ lexuriserv/ lexuriserv. do? uri=celex: 32001l0059: en: html

i used nicotine substances which you can buy from the chemist
defnyddiais sylweddau nicotîn y gallwch eu prynu o siop y fferyllydd

the ozone depleting substances regulation came into effect in october 2000
daeth rheoliad sylweddau teneuo'r osôn i rym ym mis hydref 2000

carcasses are still tested by the meat hygiene service for any illegal substances
mae'r gwasanaeth hylendid cig yn dal i gynnal profion ar garcasau i ganfod unrhyw sylweddau anghyfreithlon

i accept that there is dual diagnosis often , in that people will abuse both substances
derbyniaf fod diagnosis deublyg yn aml , ac y bydd pobl yn camddefnyddio'r ddau sylwedd

dioxins are ever-present substances produced during various combustion and incineration processes
mae diocsinau yn sylweddau sydd bob amser yn bresennol ac fe'u cynhyrchir yn ystod amryw brosesau hylosgi a llosgi

a poisonous substance which could be harmful.
sylwedd wenwynig a allai fod yn niweidiol.