must be available
必须是可用的
例句:
1.
At least one file must be available.
至少一个文件必须可用。
2.
For these technologies to make the jump from development labs and small trials to fulldeployment at airports they must be available at a price that airports are prepared topay.
因为要让这些技术跃出实验室的大门，从零星试点变为统一配备，其价格必须平易近人，维持在机场能够支付的水平。
