L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
Got it!
找到了！
We certainly expect our product to be available by October 1.
我们的产品在可在10月1日前准备好。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，