実験中は温度を一定に保つ必要があります。
Jikkenchuu wa ondo o ittei ni tamotsu hitsuyou ga arimasu.
It is necessary to keep the temperature constant during the experiment.
今日の温度は昨日より高いです。
Kyou no ondo wa kinou yori takai desu.
Today's temperature is higher than yesterday's.