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The phrase 'contains traces of' is a valid and usable phrase in written English.
You can use this phrase to express that something has a small amount of a certain substance or element. For example, "The soil sample contains traces of lead."
Exact(58)
He said the final piece of evidence was finding a blue plastic spoon and a container in a wastebasket in Mr. Berndt's classroom that contains traces of semen, which DNA testing established to be from Mr. Berndt.
The succulent flesh also contains traces of selenium and zinc.
Industrial hemp contains traces of THC, which makes its cousin, marijuana, illegal.
However, the raffinate stream contains traces of butadiene (up to approximately 1%).
The result is a single packet that contains traces of information from each of the original packets.
However, most scientists are very skeptical that the Allan Hills meteorite actually contains traces of past Martian life.
Now, the government says that 22 dairy companies, including export brands like Mengniu and Yili, have produced powdered baby formula that contains traces of melamine.
A vegetarian restaurant owner's decision not to accept the new £5 note because it contains traces of meat byproducts has come under fire from vegetarians and omnivores alike.
When almond flavour (benzaldehyde) is derived from natural sources, such as peach and apricot pits, it contains traces of hydrogen cyanide, a deadly poison.
Similar(2)
The walls contain traces of coloured murals.
They also contain traces of chlorine.
More suggestions(17)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com