初期恒星体 Young stellar object ; YSOS

体时期恒量 Individual Time-invariant Variable

二期恒载 secondary dead load

恒指期权 Hang Seng Index Options ; haha Hang Seng Index Options

恒指期货 Hang Seng Index Futures ; haha Hang Seng Index Futures

恒星周期 [天] sidereal period

恒等周期 [数] identity period ; repeating unit ; identity

期望恒在 Hope Has A Place

恒定周期 fixed cycle ; constant cycle