helium
helium — noun
1. a very light colourless gas with no smell or taste that cannot catch fire or rea
a very light colourless gas with no smell or taste that cannot catch fire or react with other substances, used for filling balloons, cooling scientific equipment, and creating a safe environment for welding
Mei smiled as the helium balloon she had just released drifted up to the ceiling.
collocation: helium balloon
Karim checks the liquid helium level in the MRI machine every morning before work.
collocation: liquid helium
Hassan and his brother filled twenty helium balloons for the school science fair.
The research team needs liquid helium to keep their experiment at very low temperatures.
A small leak in the helium tank set off the alarm in the physics laboratory.
文法句型
helium + noun (as modifier)
uncountable: helium is / was
用法筆記
Helium is an uncountable noun in everyday use ('The balloon is filled with helium'). In scientific contexts, it can be used with 'a' when referring to a specific type or isotope ('a rare isotope of helium').